feat: Refactor TychoEncoder

We have a trait TychoEncoder and then two implementations: TychoRouterEncoder and TychoExecutorEncoder.
This way we go a level above with the decision if it is a direct execution or if it should use the tycho router.

- Created two builders: one for each tycho encoder
- Delete ExecutorStrategyEncoder and move code straight into the TychoExecutorEncoder
- Add validate_solution to trait TychoEncoder
- Move group_swaps.rs a level up
- Update tests and usage cases

Doing this we get rid of all that weird stuff we were doing before

--- don't change below this line ---
ENG-4306 Took 2 hours 6 minutes


Took 12 seconds

src/encoding/evm/mod.rs

@@ -1,7 +1,8 @@
 pub mod approvals;
 mod constants;
-pub mod encoder_builder;
+pub mod encoder_builders;
+mod group_swaps;
 pub mod strategy_encoder;
 mod swap_encoder;
-pub mod tycho_encoder;
+pub mod tycho_encoders;
 pub mod utils;