Adding type annotations to scene.py and vector_space_scene.py

[henrikmidtiby]

Overview: What does this pull request change?

Further Information and Comments

This pull request is related to the ongoing effort of adding type annotations to Manim https://github.com/ManimCommunity/manim/issues/3375

Reviewer Checklist

• [ ] The PR title is descriptive enough for the changelog, and the PR is labeled correctly
• [ ] If applicable: newly added non-private functions and classes have a docstring including a short summary and a PARAMETERS section
• [ ] If applicable: newly added functions and classes are tested