Add semantic version type

[jbkroner]

Adding a semantic version type as requested in #2506 in the pydantic repo.

The implementation here is just the example from the python-semver docs + some additional tests.

When this PR gets a thumbs up I will update the docs in python-semver.

Any feedback appreciated, cheers.

edit: tracking on coverage and 3.8 compatibility issues, will try to get that covered early this week before marking as ready for review.

Selected Reviewer: @yezz123

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (e186814) to head (563284f).
Report is 38 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##              main      #199    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files           11        17     +6     
  Lines          685       960   +275     
  Branches       169       232    +63     
==========================================
+ Hits           685       960   +275     

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[jbkroner]

please review

[yezz123]

Hey, @jbkroner can you please address these small enhancements, I would be happy to merge this PR after!

Thanks 👍🏻

[jbkroner]

@yezz123 fixes applied. apologies for the extra commits - didn't click that I could run the linter / pre-commit stuff locally (duh) following the instructions in the main pydantic repo.

[yezz123]

@yezz123 fixes applied. apologies for the extra commits - didn't click that I could run the linter / pre-commit stuff locally (duh) following the instructions in the main pydantic repo.

No Problem now we have it ready we can merge it, Thanks for the great work @jbkroner 🚀