feat(tycho-router-encoder): Select strategy depending on the solution

- The tycho router address default is set at the EncoderBuilder level (not inside the strategies)
- Rename TychoCoreChain to TychoCommonChain
- Only take TychoCommonChain as an argument at the outermost level: EncoderBuilder. Everywhere else we use the execution Chain right away

--- don't change below this line ---
ENG-4332 Took 1 hour 10 minutes

src/encoding/evm/approvals/permit2.rs

@@ -175,7 +175,7 @@ mod tests {
 
     use alloy_primitives::Uint;
     use num_bigint::BigUint;
-    use tycho_common::models::Chain as TychoCoreChain;
+    use tycho_common::models::Chain as TychoCommonChain;
 
     use super::*;
 
@@ -211,7 +211,7 @@ mod tests {
     }
 
     fn eth_chain() -> Chain {
-        TychoCoreChain::Ethereum.into()
+        TychoCommonChain::Ethereum.into()
     }
 
     #[test]