deprecate MuData methods whose AnnData analogs will be deprecated in 0.13

[ilia-kats]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.02%. Comparing base (5ccf921) to head (0c6daac).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #131      +/-   ##
==========================================
+ Coverage   90.98%   91.02%   +0.03%     
==========================================
  Files          11       11              
  Lines        1797     1805       +8     
==========================================
+ Hits         1635     1643       +8     
  Misses        162      162              

Files with missing lines	Coverage Δ
src/mudata/_core/mudata.py	93.18% <100.00%> (+0.06%)	⬆️
src/mudata/_core/utils.py	95.18% <100.00%> (-0.06%)	⬇️

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[ilan-gold]

Very wonderful! I think this helper is awesome!

[gtca]

By the way, would it be sensible to leave mod_names out of deprecation though? It seems sensible for obs_keys etc. to match AnnData deprecations but mod_names are more similar to obs_names in spirit (and name).

Or is there a technical reason to deprecate anything that uses .keys() internally, @ilia-kats, @ilan-gold?

[ilia-kats]

No technical reason, but mod_names doesn't really save you any typing compared to mod.keys(), and while obs_names is at least assignable, mod_names is not, so I don't really see a usecase for it. But perhaps I'm wrong?