Add row and column indices of points in 2D CrystalMap

[hakonanes]

Description of the change

Add row and column attributes to CrystalMap to keep track of map point indices. This was necessary to clearly demonstrate indexing/slicing of crystal maps in a new example (see docs built from this PR).

All other changes are related to silencing of many warnings in the tests, some type hints, and removal of setting of parameters with the default values (unnecessary).

Progress of the PR

• [x] Docstrings for all functions
• [x] Unit tests with pytest for all lines
• [x] Clean code style by running black via pre-commit

Minimal example of the bug fix or new feature

See example in the docs built from this PR.

For reviewers

• [ ] The PR title is short, concise, and will make sense 1 year later.
• [ ] New functions are imported in corresponding __init__.py.
• [ ] New features, API changes, and deprecations are mentioned in the unreleased section in CHANGELOG.rst.
• [ ] Contributor(s) are listed correctly in __credits__ in orix/__init__.py and in .zenodo.json.

[hakonanes]

@anderscmathisen, I've updated the contributing guide informing that calls like pip install -e .[doc] must be replaced by pip install -e '.[doc]' with zsh shells (Apple's replacement of good ol' bash in newer OS'). Thank you for reporting this issue (in person)!

[hakonanes]

Thanks a lot for reviewing, @harripj!