feat: Add evm feature gate

- Move all evm code inside evm directory
- StrategyEncoder:
  - Kept StrategyEncoder trait but created a new one: EVMStrategyEncoder to implement encode_protocol_header (that is evm specific).
  - All StrategyEncoders implement both traits now
  - Renamed DefaultStrategySelector -> EVMStrategySelector
- RouterEncoder:
  - Created a RouterEncoder trait and a EVMRouterEncoder that implements it
- Moved utils inside evm directory as well
- Renamed config.json -> executor_addresses.json and moved it to a higher config directory
- Make alloy optional and dependent on the evm feature gate

--- don't change below this line ---
ENG-4075 <#DTT#>

src/encoding/evm/strategy_encoder/encoder.rs

@@ -0,0 +1,198 @@
+use std::{cmp::min, str::FromStr};
+
+use alloy_primitives::Address;
+use alloy_sol_types::SolValue;
+use anyhow::Error;
+use num_bigint::BigUint;
+use num_traits::Zero;
+
+use crate::encoding::{
+    evm::{
+        swap_encoder::SWAP_ENCODER_REGISTRY,
+        utils::{biguint_to_u256, ple_encode},
+    },
+    models::{ActionType, EncodingContext, NativeAction, Solution, PROPELLER_ROUTER_ADDRESS},
+    strategy_encoder::StrategyEncoder,
+};
+
+#[allow(dead_code)]
+pub trait EVMStrategyEncoder: StrategyEncoder {
+    fn encode_protocol_header(
+        &self,
+        protocol_data: Vec<u8>,
+        executor_address: Address,
+        // Token indices, split, and token inclusion are only used for split swaps
+        token_in: u16,
+        token_out: u16,
+        split: u16, // not sure what should be the type of this :/
+    ) -> Vec<u8> {
+        let args = (executor_address, token_in, token_out, split, protocol_data);
+        args.abi_encode()
+    }
+}
+
+pub struct SingleSwapStrategyEncoder {}
+impl EVMStrategyEncoder for SingleSwapStrategyEncoder {}
+
+impl StrategyEncoder for SingleSwapStrategyEncoder {
+    fn encode_strategy(&self, _solution: Solution) -> Result<Vec<u8>, Error> {
+        todo!()
+    }
+
+    fn action_type(&self, exact_out: bool) -> ActionType {
+        if exact_out {
+            ActionType::SingleExactOut
+        } else {
+            ActionType::SingleExactIn
+        }
+    }
+
+    fn selector(&self, exact_out: bool) -> &str {
+        if exact_out {
+            "singleExactOut(uint256, bytes)"
+        } else {
+            "singleExactIn(uint256, bytes)"
+        }
+    }
+}
+
+pub struct SequentialStrategyEncoder {}
+impl EVMStrategyEncoder for SequentialStrategyEncoder {}
+
+impl StrategyEncoder for SequentialStrategyEncoder {
+    fn encode_strategy(&self, solution: Solution) -> Result<Vec<u8>, Error> {
+        let check_amount = if solution.check_amount.is_some() {
+            let mut check_amount = solution.check_amount.clone().unwrap();
+            if solution.slippage.is_some() {
+                let one_hundred = BigUint::from(100u32);
+                let slippage_percent = BigUint::from((solution.slippage.unwrap() * 100.0) as u32);
+                let multiplier = &one_hundred - slippage_percent;
+                let expected_amount_with_slippage =
+                    (&solution.expected_amount * multiplier) / one_hundred;
+                check_amount = min(check_amount, expected_amount_with_slippage);
+            }
+            check_amount
+        } else {
+            BigUint::ZERO
+        };
+
+        let mut swaps = vec![];
+        for (index, swap) in solution.swaps.iter().enumerate() {
+            let is_last = index == solution.swaps.len() - 1;
+            let registry = SWAP_ENCODER_REGISTRY.read().unwrap();
+            let swap_encoder = registry
+                .get_encoder(&swap.component.protocol_system)
+                .expect("Swap encoder not found");
+            let router_address = if solution.router_address.is_some() {
+                solution.router_address.clone().unwrap()
+            } else {
+                PROPELLER_ROUTER_ADDRESS.clone()
+            };
+            let receiver = if is_last { solution.receiver.clone() } else { router_address.clone() };
+
+            let encoding_context = EncodingContext {
+                receiver,
+                exact_out: solution.exact_out,
+                address_for_approvals: router_address,
+            };
+            let protocol_data = swap_encoder.encode_swap(swap.clone(), encoding_context)?;
+            let executor_address = swap_encoder.executor_address();
+            let swap_data = self.encode_protocol_header(
+                protocol_data,
+                Address::from_str(executor_address).expect("Couldn't convert executor address"),
+                0,
+                0,
+                0,
+            );
+            swaps.push(swap_data);
+        }
+
+        let encoded_swaps = ple_encode(swaps);
+
+        let (mut unwrap, mut wrap) = (false, false);
+        if solution.native_action.is_some() {
+            match solution.native_action.unwrap() {
+                NativeAction::Wrap => wrap = true,
+                NativeAction::Unwrap => unwrap = true,
+            }
+        }
+        let method_calldata = (
+            wrap,
+            unwrap,
+            biguint_to_u256(&solution.given_amount),
+            !check_amount.is_zero(), /* if check_amount is zero, then we don't need to check */
+            biguint_to_u256(&check_amount),
+            encoded_swaps,
+        )
+            .abi_encode();
+        Ok(method_calldata)
+    }
+
+    fn action_type(&self, exact_out: bool) -> ActionType {
+        if exact_out {
+            ActionType::SequentialExactOut
+        } else {
+            ActionType::SequentialExactIn
+        }
+    }
+
+    fn selector(&self, exact_out: bool) -> &str {
+        if exact_out {
+            "sequentialExactOut(uint256, uint256, bytes[])"
+        } else {
+            "sequentialExactIn(uint256, uint256, bytes[])"
+        }
+    }
+}
+
+pub struct SplitSwapStrategyEncoder {}
+impl EVMStrategyEncoder for SplitSwapStrategyEncoder {}
+impl StrategyEncoder for SplitSwapStrategyEncoder {
+    fn encode_strategy(&self, _solution: Solution) -> Result<Vec<u8>, Error> {
+        todo!()
+    }
+    fn action_type(&self, _exact_out: bool) -> ActionType {
+        ActionType::SplitIn
+    }
+
+    fn selector(&self, _exact_out: bool) -> &str {
+        "splitExactIn(uint256, address, uint256, bytes[])"
+    }
+}
+
+/// This strategy encoder is used for solutions that are sent directly to the pool.
+/// Only 1 solution with 1 swap is supported.
+pub struct StraightToPoolStrategyEncoder {}
+impl EVMStrategyEncoder for StraightToPoolStrategyEncoder {}
+impl StrategyEncoder for StraightToPoolStrategyEncoder {
+    fn encode_strategy(&self, solution: Solution) -> Result<Vec<u8>, Error> {
+        if solution.router_address.is_none() {
+            return Err(anyhow::anyhow!(
+                "Router address is required for straight to pool solutions"
+            ));
+        }
+        let swap = solution.swaps.first().unwrap();
+        let registry = SWAP_ENCODER_REGISTRY.read().unwrap();
+        let swap_encoder = registry
+            .get_encoder(&swap.component.protocol_system)
+            .expect("Swap encoder not found");
+        let router_address = solution.router_address.unwrap();
+
+        let encoding_context = EncodingContext {
+            receiver: solution.receiver,
+            exact_out: solution.exact_out,
+            address_for_approvals: router_address,
+        };
+        let protocol_data = swap_encoder.encode_swap(swap.clone(), encoding_context)?;
+        // TODO: here we need to pass also the address of the executor to be used
+        Ok(protocol_data)
+    }
+
+    fn action_type(&self, _exact_out: bool) -> ActionType {
+        unimplemented!();
+    }
+
+    fn selector(&self, _exact_out: bool) -> &str {
+        unimplemented!();
+    }
+}