Fix Enum typing

[Luc1412]

Summary

This PR fixes typing for Enum. This inlcudes:

• Accessing .value of an enum causes Cannot access attribute "value" for class "CosmeticType"
• Enum.EXAMPLE can't be assigned to Enum, since it's a Literal[str](Argument of type "Literal['track']" cannot be assigned to parameter "type" of type "CosmeticType" in function "__new__")

Checklist

• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
• This PR fixes an issue.
• This PR adds something new (e.g. new method or parameters).
• This PR is a breaking change (e.g. methods or parameters removed/renamed)
• This PR is not a code change (e.g. documentation, README, ...)