feat: Add chain in config.json for the executor addresses

--- don't change below this line ---
ENG-4075 <#DTT#>

src/encoding/swap_encoder/config.json

@@ -1,6 +1,8 @@
 {
   "executors": {
-    "uniswap_v2": "0x5C2F5a71f67c01775180ADc06909288B4C329308",
+    "ethereum": {
-    "vm:balancer_v2": "0x543778987b293C7E8Cf0722BB2e935ba6f4068D4"
+      "uniswap_v2": "0x5C2F5a71f67c01775180ADc06909288B4C329308",
+      "vm:balancer_v2": "0x543778987b293C7E8Cf0722BB2e935ba6f4068D4"
+    }
   }
 }

src/encoding/swap_encoder/mod.rs

@@ -1,6 +1,7 @@
 use std::sync::RwLock;
 
 use lazy_static::lazy_static;
+use tycho_core::dto::Chain;
 
 use crate::encoding::swap_encoder::registry::{Config, SwapEncoderRegistry};
 
@@ -11,6 +12,6 @@ mod swap_struct_encoder;
 lazy_static! {
     pub static ref SWAP_ENCODER_REGISTRY: RwLock<SwapEncoderRegistry> = {
         let config = Config::from_file("config.json").expect("Failed to load configuration file");
-        RwLock::new(SwapEncoderRegistry::new(config))
+        RwLock::new(SwapEncoderRegistry::new(config, Chain::Ethereum))
     };
 }

src/encoding/swap_encoder/registry.rs

@@ -1,6 +1,7 @@
 use std::{collections::HashMap, fs};
 
 use serde::Deserialize;
+use tycho_core::dto::Chain;
 
 use crate::encoding::swap_encoder::{
     builder::SwapEncoderBuilder, swap_struct_encoder::SwapEncoder,
@@ -11,15 +12,18 @@ pub struct SwapEncoderRegistry {
 }
 
 impl SwapEncoderRegistry {
-    pub fn new(config: Config) -> Self {
+    pub fn new(config: Config, blockchain: Chain) -> Self {
         let mut encoders = HashMap::new();
-
+        let executors = config
-        for (protocol, executor_address) in config.executors {
+            .executors
+            .get(&blockchain)
+            .unwrap_or_else(|| panic!("No executors found for blockchain: {}", blockchain));
+        for (protocol, executor_address) in executors {
             let builder = SwapEncoderBuilder::new(&protocol, &executor_address);
             let encoder = builder.build().unwrap_or_else(|_| {
                 panic!("Failed to build swap encoder for protocol: {}", protocol)
             });
-            encoders.insert(protocol, encoder);
+            encoders.insert(protocol.to_string(), encoder);
         }
 
         Self { encoders }
@@ -33,7 +37,8 @@ impl SwapEncoderRegistry {
 
 #[derive(Deserialize)]
 pub struct Config {
-    pub executors: HashMap<String, String>, // Protocol -> Executor address mapping
+    pub executors: HashMap<Chain, HashMap<String, String>>, /* Blockchain -> {Protocol ->
+                                                             * Executor address} mapping */
 }
 
 impl Config {