Setup CI

[Ritunjai-Sharma]

PR for setting up CI + checks.
Associated Issue: #9

The following work was done in this PR:

• The CI had been automatically disabled due to inactivity in the repo for an extended period of time. This has now been turned back on, meaning CI checks now fire when pushing code to a branch
• PRs had no guardrails meaning anyone could merge a PR into main without PR approval. This has now been fixed by updating the settings here.
• The CI configuration, i.e., python-package.yml has been updated to follow tubular's configuration
• Spelling mistakes in the repo have been fixed using codespell
• Switched to prek for running pre-commit checks like tubular
• Removed some stale references to tubular in the repo

Notes for the reviewer:

• As part of updating python-package.yml to match current setup of tubular, I tried using uv pip install .[dev] like here. However, this was causing matrix testing specifically for python 3.10 (all other python versions passed the tests) to fail due to some SHAP related errors. Here's the failing build for reference. Therefore, I haven't made this change for now. Let me know if this change is needed and if so, can create an issue on the board to investigate it in depth.

[adamsardar]

Thanks for the changes. All looks good!