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/strategy_encoder.rs

@@ -1,6 +1,10 @@
-use tycho_core::{dto::Chain, Bytes};
+use tycho_core::Bytes;
 
-use crate::encoding::{errors::EncodingError, models::Solution, swap_encoder::SwapEncoder};
+use crate::encoding::{
+    errors::EncodingError,
+    models::{Chain, Solution},
+    swap_encoder::SwapEncoder,
+};
 
 pub trait StrategyEncoder {
     fn encode_strategy(