Implements a new test case for the GJK algorithm
to verify collision detection when colliders share the same origin.
This enhances the robustness of collision detection in scenarios
where objects are positioned at the same location.
Removes the separate `Simplex` class and integrates its functionality directly into the `GjkAlgorithm`. This simplifies the code and reduces unnecessary overhead.
Updates tests to align with refactored implementation.
Adds GJK algorithm implementation for detecting collisions between mesh colliders.
Includes mesh collider definition and unit tests for basic collision detection.
Provides a foundation for more complex collision handling and physics interactions.
