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/selector.rs

@@ -0,0 +1,28 @@
+use crate::encoding::{
+    evm::strategy_encoder::encoder::{
+        SequentialStrategyEncoder, SingleSwapStrategyEncoder, SplitSwapStrategyEncoder,
+        StraightToPoolStrategyEncoder,
+    },
+    models::Solution,
+    strategy_encoder::{StrategyEncoder, StrategySelector},
+};
+
+pub struct EVMStrategySelector;
+
+impl StrategySelector for EVMStrategySelector {
+    fn select_strategy(&self, solution: &Solution) -> Box<dyn StrategyEncoder> {
+        if solution.straight_to_pool {
+            Box::new(StraightToPoolStrategyEncoder {})
+        } else if solution.swaps.len() == 1 {
+            Box::new(SingleSwapStrategyEncoder {})
+        } else if solution
+            .swaps
+            .iter()
+            .all(|s| s.split == 0.0)
+        {
+            Box::new(SequentialStrategyEncoder {})
+        } else {
+            Box::new(SplitSwapStrategyEncoder {})
+        }
+    }
+}