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/models.rs

@@ -78,12 +78,3 @@ pub struct EncodingContext {
     pub exact_out: bool,
     pub address_for_approvals: Bytes,
 }
-
-#[allow(dead_code)]
-pub enum ActionType {
-    SingleExactIn = 1,
-    SingleExactOut = 2,
-    SequentialExactIn = 3,
-    SequentialExactOut = 4,
-    SplitIn = 5,
-}