Autoformat with black and isort

[tsalo]

Closeas #198. This adds a linting job as well.

Changes proposed in this pull request

• Ignore external libraries in flake8, isort, and black configs.
• Run isort and black on the internal code.
• Consolidate test files in one folder.
• Add a linting step. It didn't run, but I'm not sure why. I'll debug in a future PR.

Documentation that should be reviewed

None

[codecov-commenter]

Codecov Report

Base: 39.78% // Head: 39.81% // Increases project coverage by +0.03% 🎉

Coverage data is based on head (a92d3cd) compared to base (3bdca40).
Patch coverage: 58.70% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #205      +/-   ##
==========================================
+ Coverage   39.78%   39.81%   +0.03%     
==========================================
  Files         187      187              
  Lines       20121    20136      +15     
==========================================
+ Hits         8005     8018      +13     
- Misses      12116    12118       +2     

Impacted Files	Coverage Δ
aslprep/__main__.py	0.00% <0.00%> (ø)
aslprep/_warnings.py	0.00% <0.00%> (ø)
aslprep/cli/aggregate_qc.py	0.00% <0.00%> (ø)
aslprep/cli/run.py	0.00% <0.00%> (ø)
aslprep/tests/testing.py	0.00% <0.00%> (ø)
aslprep/tests/tests.py	0.00% <0.00%> (ø)
aslprep/tests/utils.py	33.82% <ø> (ø)
aslprep/utils/meepi.py	25.00% <0.00%> (ø)
aslprep/utils/misc.py	100.00% <ø> (ø)
aslprep/utils/sentry.py	0.00% <0.00%> (ø)
... and 30 more

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