XCTest Performance Testing

We should investigate if we can use XCTest's performance testing features to implement automatic performance tests on CI. This to prevent regressions in high performance-sensitive code when adding new features.

**APIs that would be good to performance test:**

- [ ] `Timeline`, since it's the backbone of all updates, including actions & animations.
- [ ] `Action`, since it is the base class for all actions.
- [ ] `TextureManager`, since it loads all textures, which is a very common operation.

**Questions to discuss**

- [ ] Can we run these type of performance tests on CI without causing flakiness?