Backport PR #1434 on branch 0.15.x (add arches query data prep)

[meeseeksmachine]

Backport PR #1434: add arches query data prep

[codecov]

Codecov Report

Merging #1441 (778c8ea) into 0.15.x (7455878) will decrease coverage by 0.05%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           0.15.x    #1441      +/-   ##
==========================================
- Coverage   91.03%   90.97%   -0.06%     
==========================================
  Files         111      111              
  Lines        8700     8743      +43     
==========================================
+ Hits         7920     7954      +34     
- Misses        780      789       +9     

Impacted Files	Coverage Δ
scvi/data/fields/_scanvi.py	96.87% <ø> (-0.10%)	⬇️
scvi/model/base/_utils.py	95.68% <50.00%> (-1.36%)	⬇️
scvi/data/_compat.py	90.38% <75.00%> (-1.54%)	⬇️
scvi/model/base/_archesmixin.py	90.55% <87.17%> (-2.01%)	⬇️
scvi/model/base/_base_model.py	89.36% <100.00%> (+0.07%)	⬆️

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