[3.11] gh-106602: [Enum] Add __copy__ and __deepcopy__ (GH-106694)

gh-106602: [Enum] Add __copy__ and __deepcopy__ (GH-106666)
(cherry picked from commit 357e9e9da3)

Co-authored-by: Prince Roshan <princekrroshan01@gmail.com>

Lib/enum.py

@@ -1227,6 +1227,12 @@ class Enum(metaclass=EnumType):
     def __reduce_ex__(self, proto):
         return self.__class__, (self._value_, )
 
+    def __deepcopy__(self,memo):
+        return self
+
+    def __copy__(self):
+        return self
+
     # enum.property is used to provide access to the `name` and
     # `value` attributes of enum members while keeping some measure of
     # protection from modification, while still allowing for an enumeration