Add large experimental datasets and master patterns to data module

[hakonanes]

Description of the change

This PR adds five datasets to the data module, which will be used in coming documentation of new functionality in follow-up PRs:

• si_wafer(): (50, 50) patterns of (480, 480) pixel, available for download from Zenodo at https://zenodo.org/record/7491388. About 500 MB.
• ni_gain0(): (149, 200) patterns of (60, 60) pixels, available for download from Zenodo at https://zenodo.org/record/7498632. The existing experimental Ni datasets in the package are extracted from this dataset. About 110 MB.
• ni_gain0_calibration(): Nine calibration patterns of (480, 480) pixels acquired with the above dataset (available from the same Zenodo repository).
• ni_ebsd_master_pattern(): Full (1001, 1001) pixel resolution dynamical simulation with EMsoft of Ni, energies 5-20 kV. Available for download from Zenodo at https://zenodo.org/record/7498645. About 310 MB.
• si_ebsd_master_pattern(): Full (1001, 1001) pixel resolution dynamical simulation with EMsoft of Si, energies 5-20 kV. Available for download from Zenodo at https://zenodo.org/record/7498729. About 310 MB.

Other changes:

• Update year in license headers

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 = kp.data.ni_ebsd_master_pattern(allow_download=True, hemisphere="both", energy=20)
# Progressbar displayed here if not already downloaded to the local cache
>>> s
<EBSDMasterPattern, title: ni_mc_mp_20kv, dimensions: (2|1001, 1001)>
>>> s.plot(navigator=None)

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 release.py, .zenodo.json and
  .all-contributorsrc with the table regenerated.