Update CI & use pre-commit for linting

[DirkEilander]

Issue addressed

Same automation updates based on recent work in the core.

major update CI

• use pip install and caching for faster tests
• test weekly against latest hydromt core main branch
• separate linting from test based on pre-commit hooks
• add dependabot

dev environment

introduction pixi for simple environment handling and shortcuts for building docs, testing etc. Setting up a dev environment including pre-commit hooks can be done with one line pixi run dev across different OS. Installation of pixi is super straight forward. With a small script (make_env.py) we can now also administrate all dependencies in one place, the pyproject.tom. Note that dev environment still exist and use of pixi is optional

Checklist

• Updated tests or added new tests
• Branch is up to date with main
• Updated documentation if needed
• Updated changelog.rst if needed

Additional Notes (optional)

Add any additional notes or information that may be helpful.

[roeldegoede]

Mooi werk!