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/user_approvals_manager.rs

@@ -0,0 +1,15 @@
+use num_bigint::BigUint;
+use tycho_core::Bytes;
+
+#[allow(dead_code)]
+pub struct Approval {
+    pub spender: Bytes,
+    pub owner: Bytes,
+    pub token: Bytes,
+    pub amount: BigUint,
+}
+
+pub trait UserApprovalsManager {
+    #[allow(dead_code)]
+    fn encode_approvals(&self, approvals: Vec<Approval>) -> Vec<u8>;
+}