Lint code

[jlenain]

This PR proposes to lint the entire repository (except user scripts), using the rules for black and flake8 defined in our pre-commit hooks (in .pre-commit-config.yaml), and introduced in #71.

At this moment, only nectarchain.calibration.container.charge_extractor is missing, as I would like to clarify a point in the __call__ method with @guillaumegrolleron beforehand.

[codecov]

Codecov Report

Attention: 1873 lines in your changes are missing coverage. Please review.

Comparison is base (8e7be81) 6.62% compared to head (ccbf048) 7.35%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master     #74      +/-   ##
=========================================
+ Coverage    6.62%   7.35%   +0.72%     
=========================================
  Files          35      45      +10     
  Lines        3108    2978     -130     
=========================================
+ Hits          206     219      +13     
+ Misses       2902    2759     -143     

Files	Coverage Δ
src/nectarchain/__init__.py	100.00% <100.00%> (ø)
src/nectarchain/dqm/__init__.py	100.00% <100.00%> (ø)
src/nectarchain/dqm/bokeh_app/app_hooks.py	82.85% <100.00%> (ø)
.../nectarchain/dqm/bokeh_app/tests/test_app_hooks.py	100.00% <100.00%> (ø)
src/nectarchain/dqm/tests/test_db_utils.py	100.00% <100.00%> (ø)
src/nectarchain/utils/stats.py	100.00% <100.00%> (ø)
src/nectarchain/display/__init__.py	0.00% <0.00%> (ø)
src/nectarchain/dqm/db_utils.py	36.00% <80.00%> (ø)
src/nectarchain/data/__init__.py	0.00% <0.00%> (ø)
...tarchain/makers/calibration/gain/utils/__init__.py	0.00% <0.00%> (ø)
... and 33 more

... and 1 file with indirect coverage changes

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[jlenain]

I would like to propose to merge this PR now, and take care of the last few remaining lines of code to be cleaned with @guillaumegrolleron later in another PR. Lines which will in any case be changed by #78.

[jlenain]

Resolved and merged conflicts introduced when PR #78 was merged into master.

[jlenain]

Many thanks for the reviews, @vmarandon !