✨ Add support for the Gamma distribution

[o-laurent]

I would suggest releasing 0.7.1 with minor regression and EMA quality of life commits (& others, like the ViT) before inducing the config-related breaking changes from #211.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.59%. Comparing base (702806a) to head (bf0f8c6).
⚠️ Report is 3 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #213      +/-   ##
==========================================
- Coverage   98.10%   96.59%   -1.51%     
==========================================
  Files         175      165      -10     
  Lines        9165     9027     -138     
  Branches     1163     1139      -24     
==========================================
- Hits         8991     8720     -271     
- Misses        106      219     +113     
- Partials       68       88      +20     

Flag	Coverage Δ
pytest	96.59% <100.00%> (-1.51%)	⬇️

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