Test project animations

[QTechDevelopment]

Overview: What does this pull request change?

This PR introduces a new, comprehensive test suite (working_animation_test.py) to verify Manim's core animation system. It also includes an animation_demo.py scene to visually showcase various animation capabilities and an ANIMATION_TEST_SUMMARY.md documenting the successful verification.

Motivation and Explanation: Why and how do your changes improve the library?

These changes provide a clear and runnable set of tests that explicitly verify the functionality of Manim's animation classes, their properties, composition, and integration within scenes. This ensures the stability and correctness of the animation system, making it easier to confirm that animations are working as expected. The demo scene serves as a quick visual check and an example for users.

Links to added or changed documentation pages

N/A (The ANIMATION_TEST_SUMMARY.md acts as internal documentation).

Further Information and Comments

The working_animation_test.py script can be run directly using python3 working_animation_test.py to get a console-based verification of animation functionality.
The animation_demo.py scene can be rendered using python3 -m manim animation_demo.py AnimationDemo --quality l -p to visually confirm animations.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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