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/swap_encoder/mod.rs

@@ -0,0 +1,18 @@
+mod builder;
+mod encoders;
+mod registry;
+
+use std::sync::RwLock;
+
+use lazy_static::lazy_static;
+use tycho_core::dto::Chain;
+
+use crate::encoding::evm::swap_encoder::registry::{Config, SwapEncoderRegistry};
+
+lazy_static! {
+    pub static ref SWAP_ENCODER_REGISTRY: RwLock<SwapEncoderRegistry> = {
+        let config = Config::from_file("src/encoding/config/executor_addresses.json")
+            .expect("Failed to load configuration file");
+        RwLock::new(SwapEncoderRegistry::new(config, Chain::Ethereum))
+    };
+}