feat: Add selector to Transaction

Return selector in the StrategyEncoder. This is needed for the ExecutorStrategyEncoder

--- don't change below this line ---
ENG-4088 Took 12 minutes


Took 13 seconds

src/encoding/strategy_encoder.rs

@@ -4,7 +4,10 @@ use crate::encoding::{errors::EncodingError, models::Solution, swap_encoder::Swa
 
 /// Encodes a solution using a specific strategy.
 pub trait StrategyEncoder {
-    fn encode_strategy(&self, to_encode: Solution) -> Result<(Vec<u8>, Bytes), EncodingError>;
+    fn encode_strategy(
+        &self,
+        to_encode: Solution,
+    ) -> Result<(Vec<u8>, Bytes, Option<String>), EncodingError>;
 
     #[allow(clippy::borrowed_box)]
     fn get_swap_encoder(&self, protocol_system: &str) -> Option<&Box<dyn SwapEncoder>>;