Use standard version API

[flying-sheep]

• Closes Use standard API for version information #1317
• Tests added
• Release note added (or unnecessary)

We could introduce a cached version helper like in scanpy, but so far that’s not necessary

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (c1afc3e) 85.70% compared to head (27abcb5) 83.54%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1318      +/-   ##
==========================================
- Coverage   85.70%   83.54%   -2.17%     
==========================================
  Files          34       34              
  Lines        5450     5450              
==========================================
- Hits         4671     4553     -118     
- Misses        779      897     +118     

Flag	Coverage Δ
gpu-tests	?

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Files	Coverage Δ
anndata/_io/utils.py	76.47% <100.00%> (ø)
anndata/compat/__init__.py	76.57% <80.00%> (-1.36%)	⬇️

... and 6 files with indirect coverage changes