feat(python): impl accept new friend verification

Author: lich0821

clients/python/wcferry/client.py

@@ -647,7 +647,6 @@ def accept_new_friend(self, v3: str, v4: str, scene: int = 30) -> int:
         Returns:
             int: 1 为成功，其他失败
         """
-        raise Exception("Not implemented, yet")
         req = wcf_pb2.Request()
         req.func = wcf_pb2.FUNC_ACCEPT_FRIEND  # FUNC_ACCEPT_FRIEND
         req.v.v3 = v3