Build with UV and Hatchling

[jschlyter]

Move from Poetry to UV and Hatchling. This change will result in:

• faster builds and more joy
• dynamic versioning, version automagically set from latest GitHub release tag

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 76.42%. Comparing base (2b735fe) to head (89490a1).

Files with missing lines	Patch %	Lines
src/cryptojwt/__init__.py	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #186      +/-   ##
==========================================
- Coverage   76.45%   76.42%   -0.03%     
==========================================
  Files          44       44              
  Lines        4489     4492       +3     
  Branches      841      841              
==========================================
+ Hits         3432     3433       +1     
- Misses        777      779       +2     
  Partials      280      280              

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