Aocli

Features:
- Add various additional functionality (e.g. `Graph`, `find_neighbouring_indices_2d`, etc.)
- Make this project public
- Add `pre-commit` hooks (including CI)
- Publishes releases using `flit`

**Full Changelog**: https://github.com/sgraaf/Advent-of-Code-Utils/compare/v0.1.0...v0.2.0