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/approvals/permit2.rs

@@ -0,0 +1,42 @@
+use std::str::FromStr;
+
+use alloy_primitives::U256;
+use tycho_core::Bytes;
+
+use crate::encoding::user_approvals_manager::{Approval, UserApprovalsManager};
+
+#[allow(dead_code)]
+pub struct Permit2 {
+    pub address: Bytes,
+}
+
+#[allow(dead_code)]
+impl Permit2 {
+    pub fn new() -> Self {
+        Self {
+            address: Bytes::from_str("0x000000000022D473030F116dDEE9F6B43aC78BA3")
+                .expect("Permit2 address not valid"),
+        }
+    }
+    fn get_allowance_data(
+        &self,
+        _user: Bytes,
+        _router_address: Bytes,
+        _token: Bytes,
+    ) -> (U256, u64, U256) {
+        // get allowance data (if it exists) and the nonce
+        //  returns permitAmount, expiration, nonce
+        todo!()
+    }
+}
+impl UserApprovalsManager for Permit2 {
+    fn encode_approvals(&self, _approvals: Vec<Approval>) -> Vec<u8> {
+        // calls get_allowance_data to get nonce
+        // checks if we are not permitted already
+        // puts data into a permitSingle struct if there is only 1 PermitDetails, if there are
+        // several, use PermitBatch   adds the nonce and the expiration (uniswap recommends
+        // 30 days for expiration) signs data
+        // returns encoded data
+        todo!()
+    }
+}