chore: add pre-commit hooks

[Yun-Kim]

Description

In order to automate linting and formatting tools including black, flake8, isort, and mypy and pre-commit tools including EOF and whitespace trimming and YAML file checking, a pre-commit hook configuration was set up.

This was initially done with the pre-commit package, but it did not allow synchronization with our riot tool versions. Thus, we moved to using autohook which is a simple shell script that runs our riot commands and lets us avoid having to maintain additional versions.

Note: in order to use these pre-commit hooks, the following command must be run once beforehand:
pre-commit install hooks/autohook.sh install. This has been addressed by adding the riot command riot run pre-commit riot run autohook which can be run once and installs the pre-commit autohook pre-commit script and initializes the riot hooks to be run on git commit commands.

[codecov-commenter]

Codecov Report

Merging #2324 (1a54f21) into master (d411dee) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #2324   +/-   ##
=======================================
  Coverage   91.22%   91.22%           
=======================================
  Files         573      573           
  Lines       41239    41256   +17     
=======================================
+ Hits        37621    37637   +16     
- Misses       3618     3619    +1     

Impacted Files	Coverage Δ
ddtrace/contrib/urllib3/patch.py	100.00% <100.00%> (ø)
tests/contrib/urllib3/test_urllib3.py	99.63% <100.00%> (+0.02%)	⬆️
ddtrace/profiling/exporter/http.py	98.91% <0.00%> (-1.09%)	⬇️

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[Kyle-Verhoog]

👍 any reason for not including isort?

[Kyle-Verhoog]

🙌 can't wait to install these!

[jd]

What's the rationale for using a bash script rather than the pre-commit tool?

[Yun-Kim]

This was initially done with the pre-commit package, but it did not allow synchronization with our riot tool versions. Thus, we moved to using autohook which is a simple shell script that runs our riot commands and lets us avoid having to maintain additional versions.

@jd pre-commit IIRC unfortunately works by cloning github repos to grab the formatting tools and require versions to be specified, this would result in us having to maintain additional versions to be in sync with our riotfile.