Fix creation of spatial arrays for CrystalMap after pattern matching

[hakonanes]

Description of the change

• Fix Pattern matching not working for some navigation shapes #306
• Simplify _get_spatial_arrays(), add appropriate test.
• Fix typos in pattern matching user guide.

Progress of the PR

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

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 doc/changelog.rst.