feat: Separate encoding swaps from encoding txs

This way the user is responsible for encoding the Tycho Router method inputs that are used as guardrails in execution.

Interface changes:
- Create EncodedSolution
- StrategyEncoder
  - don't need to know have permit2 or token_in_already_in_router as attributes anymore
  - encode_strategy returns EncodedSolution now (no method encoding done here now)
- TychoEncoder
  - add encode_solution() method. This is the recommended method for users
  - needs to have permit2, token_in_already_in_router and router_address as attributes
  - permit creation is made in the router now

Also:
- create encoding_utils.rs
- update all tests

Took 2 hours 42 minutes


Took 3 minutes

Took 13 minutes

src/encoding/evm/approvals/permit2.rs

@@ -19,7 +19,10 @@ use tycho_common::Bytes;
 
 use crate::encoding::{
     errors::EncodingError,
-    evm::utils::{biguint_to_u256, bytes_to_address, encode_input, get_client, get_runtime},
+    evm::{
+        encoding_utils::encode_input,
+        utils::{biguint_to_u256, bytes_to_address, get_client, get_runtime},
+    },
     models::Chain,
 };