feat: Add builder pattern and registry for SwapEncoders

Save swap executor addresses in a config file

src/encoding/swap_encoder/mod.rs

@@ -0,0 +1,14 @@
+use crate::encoding::swap_encoder::registry::{Config, SwapEncoderRegistry};
+use lazy_static::lazy_static;
+use std::sync::RwLock;
+
+mod builder;
+mod registry;
+mod swap_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))
+    };
+}