Improvements for local dev and CI tools

[JWCook]

Closes #65. This also adds some other pytest, coverage, and GitHub Actions features that I use in my own projects. If there are any of these items you don't want, let me know and I'll remove it from the PR.

Scripts

• Remove dev scripts from published package
• Use nox to run dev scripts (lint, test, cover)
• Use pytest-cov plugin to run coverage
  • Makes coverage commands/args simpler, and allows integration with xdist
• Use pytest-xdist plugin to run tests in parallel
  • Given all the time.sleep() calls in tests, this significantly reduces total test time!
  • On GitHub Actions, the runners only have 2 cores, so time is roughly cut in half to ~2 mins 30 seconds. On my local machine it now runs in about 40 seconds.

GitHub Actions

• Use cache action to cache python packages until lockfile changes
  • Saves around 45 seconds per run (on cache hit)
• Use install-poetry action to install poetry
  • This uses the poetry installer, and puts poetry in its own virtualenv to avoid potential dependency conflicts
• Use codecov-action to upload coverage
• Upload coverage to codecov for PRs
  • Codecov automatically tracks coverage separately per branch
  • It also notifies you within a PR to show coverage changes (see example below)
  • It also adds a step to PR checks, and will fail if coverage decreases
  • The failure threshold can be configured in codecov.yml, if you want

[codecov[bot]]

Codecov Report

Merging #66 (a8b9a45) into master (2e68f71) will decrease coverage by 0.90%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #66      +/-   ##
==========================================
- Coverage   98.73%   97.82%   -0.91%     
==========================================
  Files           8        8              
  Lines         316      322       +6     
  Branches        0       30      +30     
==========================================
+ Hits          312      315       +3     
  Misses          4        4              
- Partials        0        3       +3     

Impacted Files	Coverage Δ
pyrate_limiter/bucket.py	93.51% <0.00%> (-2.78%)	:arrow_down:
pyrate_limiter/request_rate.py	100.00% <0.00%> (ø)
pyrate_limiter/limit_context_decorator.py	100.00% <0.00%> (ø)

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[JWCook]

I'm not quite sure why that Codedov report is saying coverage decreased.

[vutran1710]

I'm not quite sure why that Codedov report is saying coverage decreased.

i dont think its a big deal. if you think evrything ready, i will merge the pr.

[JWCook]

Yes, if it all looks good to you, go ahead and merge it.