Backport PR #1612 on branch 0.17.x (Add a static method on the BaseModelClass to return the AnnDataManger's full registry )

[meeseeksmachine]

Backport PR #1612: Add a static method on the BaseModelClass to return the AnnDataManger's full registry

[codecov]

Codecov Report

Merging #1617 (733f1da) into 0.17.x (2e7bd93) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           0.17.x    #1617   +/-   ##
=======================================
  Coverage   91.23%   91.23%           
=======================================
  Files         116      116           
  Lines        9193     9196    +3     
=======================================
+ Hits         8387     8390    +3     
  Misses        806      806           

Impacted Files	Coverage Δ
scvi/model/base/_base_model.py	92.66% <100.00%> (+0.07%)	⬆️

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