Lint with Stylua in CI workflow

[body-clock]

Add Stylua linting on push/MR to ensure collaborative code consistency.

In this case:

• The pipeline will run on pull_request events for any pull request activity.
• It will also run on push events, but only when changes are pushed to the main branch.

This means the pipeline will execute:

• Whenever a pull request is created, updated, or synchronized.
• Whenever code is pushed directly to the main branch.

I pulled this template from the nvim-lua plugin template repo.

[adam12]

Thanks! :)