ci: introduce Release Please and PR linting workflows

[thisthat]

This PR

• adds workflow for linting PR title
• adds workflow to automate the release process with Release Please

Related Issues

• fixes Automate release process #6

Notes

Builds on top of #36

How to test

Manually tested on my fork without the publishing step.

Hooks:

• Release Please PR: chore(main): release hooks/opentelemetry 0.1.4 thisthat/python-sdk-contrib#14
• Release action: https://github.com/thisthat/python-sdk-contrib/actions/runs/7995359933/job/21835517843#step:10:5

Provider:

• Release Please PR: chore(main): release providers/flagd 0.1.1 thisthat/python-sdk-contrib#16
• Release action: https://github.com/thisthat/python-sdk-contrib/actions/runs/7995418337/job/21835711626#step:4:10

Full list of releases: https://github.com/thisthat/python-sdk-contrib/releases

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (85661ff) 90.55% compared to head (bc93bcc) 90.55%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #38   +/-   ##
=======================================
  Coverage   90.55%   90.55%           
=======================================
  Files           8        8           
  Lines         180      180           
=======================================
  Hits          163      163           
  Misses         17       17           

Flag	Coverage Δ
unittests	90.55% <ø> (ø)

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[federicobond]

Awesome work @thisthat! I added just a couple of minor comments.

[federicobond]

@thisthat fix for failing build is here.