Reformat using black formatting

[jlaehne]

Description of the change

With all relevant PRs having been dealt with in the course of the split, I think it is a good occasion to enforce black formatting for the repo.

Used the black command to reformat all .py files.

Progress of the PR

• Change implemented (can be split into several points),
• add black lint test to PR-actions
• [na] add an changelog entry in the upcoming_changes folder (see upcoming_changes/README.rst),
• [na] Check formatting changelog entry in the readthedocs doc build of this PR (link in github checks)
• ready for review.

[codecov]

Codecov Report

Merging #10 (892bf4e) into main (77e79b0) will not change coverage.
The diff coverage is 76.14%.

@@           Coverage Diff           @@
##             main      #10   +/-   ##
=======================================
  Coverage   76.54%   76.54%           
=======================================
  Files          39       39           
  Lines        8336     8336           
  Branches     1931     1931           
=======================================
  Hits         6381     6381           
  Misses       1500     1500           
  Partials      455      455           

Impacted Files	Coverage Δ
rsciio/mrc/api.py	0.00% <0.00%> (ø)
rsciio/netcdf/api.py	0.00% <0.00%> (ø)
rsciio/tiff/api.py	88.31% <ø> (ø)
rsciio/tvips/api.py	98.46% <ø> (ø)
rsciio/usid_hdf5/api.py	0.00% <ø> (ø)
rsciio/utils/date_time_tools.py	95.74% <ø> (ø)
rsciio/utils/fei_stream_readers.py	90.90% <ø> (ø)
rsciio/utils/rgb_tools.py	79.62% <ø> (ø)
rsciio/utils/skimage_exposure.py	62.50% <ø> (ø)
rsciio/utils/tools.py	71.42% <ø> (ø)
... and 37 more

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