Support mixing a data type into an enum

[rchen152]

Describe the Bug

Enums support mixing in a data type by inheriting from it, e.g.:

from enum import Enum
from typing import reveal_type

class A(float, Enum):
    X = 1

reveal_type(A.X.value)  # runtime says `float`, pyrefly says `int`

Sandbox Link

https://pyrefly.org/sandbox/?project=N4IgZglgNgpgziAXKOBDAdgEwEYHsAeAdAA4CeS4ATrgLYAEM6ArvRDcbpQC50CizNADrow1el1LEI6AOZ02HbnUowAbjFRQA%2BhOIxhwgMZRUcOHQCCACjBRcqLgBo%2BAgJSJhdL3QAadALx0AIwG6CrqmjqSMFYWhD6EqppMMK4gjiBMXNBwJOSIIADEdACq2VAQEnRgTOiG2bjocKGYMGDVnDQOWgLYMJRW%2BIjy6FyudAC0AHx0cFyUHujeyjBcTJRLYIIgAHIsfQt0wPgAvtvC6SBkKrakhFy0UBTFAAqkN1Cksxg4BHSGjUgMnWDggjUIwmKAGUYDA6AALLhcYhwRAAejR1zan0InBkaMYaMwuEMcDRAJEEGBlFBjTRHUodFQSWgqGwsH%2BgKpIIaS1wxF5uWEZC48MaE3UlDgYKWgW2AGZCEEAEzndAgE4ZVD1CDqABi0BgFDQWDwRDIGqAA

(Only applicable for extension issues) IDE Information

No response