feat: Simplify StrategyEncoders and RouterEncoder

No more SingleSwapStrategyEncoder or SequentialStrategyEncoder
No more batch routing (so no need for batch permits as well). If multiple solutions are found, return multiple Transactions

--- don't change below this line ---
ENG-4076 <#DTT#>

src/encoding/strategy_encoder.rs

@@ -1,12 +1,10 @@
 use anyhow::Error;
 
-use crate::encoding::models::{ActionType, Solution};
+use crate::encoding::models::Solution;
 
 #[allow(dead_code)]
 pub trait StrategyEncoder {
     fn encode_strategy(&self, to_encode: Solution) -> Result<Vec<u8>, Error>;
-
-    fn action_type(&self, exact_out: bool) -> ActionType;
     fn selector(&self, exact_out: bool) -> &str;
 }