feat: Support Curve ETH

Curve pools use a different address from ETH (native token)

- Pass Chain into the SwapEncoderBuilder and SwapEncoder
- Add native_token_curve_address and native_token_address to CurveSwapEncoder
- Added integration test for this curve case

--- don't change below this line ---
ENG-4306 Took 1 hour 4 minutes


Took 11 seconds

src/encoding/swap_encoder.rs

@@ -1,6 +1,6 @@
 use crate::encoding::{
     errors::EncodingError,
-    models::{EncodingContext, Swap},
+    models::{Chain, EncodingContext, Swap},
 };
 
 /// A trait for protocol-specific swap encoding, where each implementation should handle the
@@ -10,7 +10,8 @@ pub trait SwapEncoder: Sync + Send {
     ///
     /// # Arguments
     /// * `executor_address` - The address of the contract that will execute the swap
-    fn new(executor_address: String) -> Self
+    /// * `chain` - The chain on which the swap will be executed
+    fn new(executor_address: String, chain: Chain) -> Result<Self, EncodingError>
     where
         Self: Sized;