feat: Add TokenTransfer class to Curve

- This needed to be in Curve so that the executor can also take care of transfers from the user into the tycho router, to avoid having transfer actions mixed between the router and executors

src/encoding/evm/constants.rs

@@ -31,7 +31,7 @@ pub static IN_TRANSFER_OPTIMIZABLE_PROTOCOLS: LazyLock<HashSet<&'static str>> =
 pub static PROTOCOLS_EXPECTING_FUNDS_IN_ROUTER: LazyLock<HashSet<&'static str>> =
     LazyLock::new(|| {
         let mut set = HashSet::new();
-        set.insert("curve");
+        set.insert("vm:curve");
         set.insert("balancer_v2");
         // TODO remove uniswap_v4 when we add callback support for transfer optimizations
         set.insert("uniswap_v4");