Introduce Black, isort and flake8 to improve code quality

[codecov-commenter]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@0796324). Click here to learn what that means. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #236   +/-   ##
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  Coverage          ?   18.77%           
=========================================
  Files             ?       13           
  Lines             ?     2407           
  Branches          ?      339           
=========================================
  Hits              ?      452           
  Misses            ?     1949           
  Partials          ?        6           

Flag	Coverage Δ
#unittests	18.77% <0.00%> (?)

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[MatthieuDartiailh]

More self-contained PR than https://github.com/pyvisa/pyvisa/pull/511. Typing, docstrings and testing will be addressed in subsequent PRs.

[MatthieuDartiailh]

bors try

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try

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bors retry

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try

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[MatthieuDartiailh]

bors try-

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bors ping

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pong

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bors try

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bors r+

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Timed out.

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bors r+

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Build succeeded:

• Tests result
• Check code formatting
• Docs building

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try

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