[Python] Stubs - update Guid -> UUID

[StudioWEngineers]

Currently the type hint in many methods is Any, since Guid is no longer defined and static checkers like mypy cannot find its definition. As example:

class File3dmObjectTable:
    def AddPoint(self, x: float, y: float, z: float) -> Guid: ...

The correct type is uuid.UUID, as discussed here.

Based on #668.