Define IRouterWithoutCollisions which Router inherits from

This ensures Router implements most of IRouterWithoutCollisions. It solely
leaves us to confirm Router implements the extensions defined in IRouter.

processor/ethereum/router/build.rs

@@ -26,13 +26,6 @@ fn main() {
     fs::create_dir(&artifacts_path).unwrap();
   }
 
-  build_solidity_contracts::build(
-    &["../../../networks/ethereum/schnorr/contracts", "../erc20/contracts", "contracts"],
-    "contracts",
-    &artifacts_path,
-  )
-  .unwrap();
-
   // This cannot be handled with the sol! macro. The Router requires an import
   // https://github.com/alloy-rs/core/issues/602
   sol(