Load either unprocessed or processed patterns from H5OINA files

[hakonanes]

Description of the change

This PR addresses #692 by adding a processed: bool = True parameter to the Oxford Instruments h5ebsd reader (H5OINA). By passing False we attempt to load the "Unprocessed Patterns", failing if they are not available.

This also fixes an issue where the unprocessed patterns were read into the EBSD signal original metadata unnecessarily. This could use a lot of memory...

Progress of the PR

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

Minimal example of the bug fix or new feature

>>> import kikuchipy as kp
>>> s_processed = kp.load("patterns.h5oina")
>>> s_unprocessed = kp.load("patterns.h5oina", processed=False)

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.
• New contributors are added to kikuchipy/__init__.py and .zenodo.json.

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