[WIP] operator implement

src/cpl_reactive_extensions/abc/operator.py

@@ -1,12 +1,8 @@
-from abc import ABC
 from typing import Any
 
 from cpl_reactive_extensions.subscriber import Subscriber
 
 
-class Operator(ABC):
-    def __init__(self):
-        ABC.__init__(self)
-
+class Operator:
     def call(self, subscriber: Subscriber, source: Any):
         pass