feat: Take Chain object containing native/wrapped addresses

- This way this chain object contains everything we need, we don't need to worry about doing any transformation or calling any supplementary functions inside any of the encoders
- Needed to move our new Chain object to a higher level since this is used in the higher-level encoder traits. This required some weird default values in the constants in order to avoid using alloy's hex literal. I could have instead opted to make Bytes parse a string I think, though this would mean possibly returning an error at the constants level, which is not nice either.

Question:
- Do we want the user to be in charge of passing the native and wrapped token every single time? This may be a bit annoying for the user. For now, I have defaulted to those in constants.rs, this would take 5 mins to remove though if you don't like it, and it would get rid of this complicated bytes initialization.

src/encoding/evm/swap_encoder/swap_encoder_registry.rs

@@ -1,9 +1,7 @@
 use std::{collections::HashMap, fs};
 
-use tycho_core::dto::Chain;
-
 use crate::encoding::{
-    errors::EncodingError, evm::swap_encoder::builder::SwapEncoderBuilder,
+    errors::EncodingError, evm::swap_encoder::builder::SwapEncoderBuilder, models::Chain,
     swap_encoder::SwapEncoder,
 };
 
@@ -15,10 +13,10 @@ pub struct SwapEncoderRegistry {
 impl SwapEncoderRegistry {
     pub fn new(executors_file_path: &str, blockchain: Chain) -> Result<Self, EncodingError> {
         let config_str = fs::read_to_string(executors_file_path)?;
-        let config: HashMap<Chain, HashMap<String, String>> = serde_json::from_str(&config_str)?;
+        let config: HashMap<String, HashMap<String, String>> = serde_json::from_str(&config_str)?;
         let mut encoders = HashMap::new();
         let executors = config
-            .get(&blockchain)
+            .get(&blockchain.name)
             .ok_or(EncodingError::FatalError("No executors found for blockchain".to_string()))?;
         for (protocol, executor_address) in executors {
             let builder = SwapEncoderBuilder::new(protocol, executor_address);