Chore/clean outdated files

[JTaeuber]

Motivation

There were a few outdated files that were pretty much unusable before. This pr aims to clean up a bunch of outdated things and format the code accordingly.

Changes

• Overhauled pre-commit-config.yaml to be usable and useful
• Adjusted Makefile to have correct information
• Fixed a bunch of python errors pointed out by pytest and mypy
• Formatted all files
• Fixed a few typos and changed install command to be less confusing
• Added correct version and maintainer info
• fixed --interval documentation value mentioned in fix(chart value): fixing interval from 60 to 30 as it's the default #109

Tests done

pytest and pre-commit ran with no errors

TODO

• I've assigned myself to this PR
• It needs to be tested that I didn't break any functionality

[github-actions]

File	Coverage
All files	97%	✅
test_autoscale_resource.py	99%	✅
test_cmd.py	100%	✅
test_events.py	100%	✅
test_grace_period.py	100%	✅
test_ignore_if_labels_dont_match.py	100%	✅
test_main.py	100%	✅
test_pods_force_uptime.py	100%	✅
test_resources.py	100%	✅
test_scaler.py	95%	✅
test_time.py	100%	✅

Minimum allowed coverage is 70%

Generated by 🐒 cobertura-action against 3c4202d

[JTaeuber]

@samuel-esp It would be awesome if you could test that i didn't break any functionality. At the moment I cannot do this effectively. I know it's a lot of changes so take your time.

[jonathan-mayer]

mostly LGTM, but we should still test it