Reports invalid definition and usage of Enum.

Example:

from enum import Enum


class Shape(Enum):
    SQUARE = 1
    CIRCLE = 2


class ExtendedShape(Shape):  # Enum class 'Shape' is final and cannot be subclassed
    TRIANGLE = 3

  from enum import Enum


  class Color(Enum):
    _value_: int
    RED = 1
    GREEN = "green"  # Type 'str' is not assignable to declared type 'int'

  from enum import Enum


  class Pet(Enum):
    CAT = 1
    DOG: int = 2  # Type annotations are not allowed for enum members