Add type hints to `animation`

[Viicos]

Part of https://github.com/ManimCommunity/manim/issues/3375.

[Viicos]

pointwise_become_partial is only available on VMobject, so the type hint is probably invalid here?

https://github.com/ManimCommunity/manim/blob/4315549c31747231eb6e5aead5408e3b2fe4de16/manim/animation/creation.py#L122-L130

[JasonGrace2282]

pointwise_become_partial is only available on VMobject, so the type hint is probably invalid here?

https://github.com/ManimCommunity/manim/blob/4315549c31747231eb6e5aead5408e3b2fe4de16/manim/animation/creation.py#L122-L130

It would seem so!

[Viicos]

Consider this a first pass. They are still too many mypy errors to actually enable this module. I first want to go over simple modules and I'll come back to this one later.