feat: use cached property to save excessive calls to callable

Author: BobTheBuidler

web3/method.py

@@ -167,7 +167,7 @@ def __get__(
     def __call__(self, *args: Any, **kwargs: Any) -> Any:
         return self.__get__(self._module)(*args, **kwargs)
 
-    @property
+    @functools.cached_property
     def method_selector_fn(
         self,
     ) -> Callable[[], RPCEndpoint]: