feat: microoptimize Method.method_selector_fn (#3696)

Author: BobTheBuidler

newsfragments/3696.performance.rst

@@ -0,0 +1 @@
+optimize Method.method_selector_function

web3/method.py

@@ -182,12 +182,13 @@ def __call__(self, *args: Any, **kwargs: Any) -> Any:
     @property
     def method_selector_fn(
         self,
-    ) -> Callable[..., RPCEndpoint]:
+    ) -> Callable[[], RPCEndpoint]:
         """Gets the method selector from the config."""
-        if callable(self.json_rpc_method):
-            return self.json_rpc_method
-        elif isinstance(self.json_rpc_method, (str,)):
-            return lambda *_: self.json_rpc_method
+        method = self.json_rpc_method
+        if callable(method):
+            return method
+        elif isinstance(method, str):
+            return lambda: method
         raise Web3ValueError(
             "``json_rpc_method`` config invalid.  May be a string or function"
         )