🚧 [WIP] Physics engine

[bal7hazar]

Closes #6

Introduced changes

Create a physical engine in cairo, inspired from https://github.com/johnBuffer/VerletSFML/blob/main/solver.hpp

Next steps

• [ ] Use it in a WASM version to validate by observation

Checklist

• [ ] Linked relevant issue
• [ ] Updated relevant documentation
• [x] Added relevant tests
• [ ] Add a dedicated CI job for new examples
• [ ] Performed self-review of the code

Workload ~ 3 days