feat: Don't sign permit2 objects

We don't want to be responsible for holding private keys -> the user is the one that should do this outside of tycho-execution

Done:
- Remove signature from EncodedSolution
- Introduce UserTransferType and pass that everywhere instead of is_permit2_active and token_in_already_in_router
- Remove signing from permit2. Added it to the encoding_utils.rs only
- Mark encode_full_calldata as deprecated
- Backwards compatibility: still accept a signer for the encode_full_calldata case
- Update all tests

Took 2 hours 10 minutes


Took 13 minutes

src/encoding/tycho_encoder.rs

@@ -61,6 +61,7 @@ pub trait TychoEncoder {
     ///
     /// # Returns
     /// A vector of fully constructed [`Transaction`]s that can be submitted to a node or bundler.
+    #[deprecated(note = "Please use `encode_solutions` instead")]
     fn encode_full_calldata(
         &self,
         solutions: Vec<Solution>,