Backport PR #1396 on branch 0.10.x (remove circularity and implicit module members)

[meeseeksmachine]

Backport PR #1396: remove circularity and implicit module members

[codecov]

Codecov Report

Attention: Patch coverage is 98.03922% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 83.78%. Comparing base (7827524) to head (1fbd3aa).

Additional details and impacted files

@@            Coverage Diff             @@
##           0.10.x    #1397      +/-   ##
==========================================
- Coverage   85.94%   83.78%   -2.16%     
==========================================
  Files          36       37       +1     
  Lines        5491     5500       +9     
==========================================
- Hits         4719     4608     -111     
- Misses        772      892     +120     

Flag	Coverage Δ
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Files	Coverage Δ
anndata/__init__.py	79.16% <100.00%> (+0.90%)	⬆️
anndata/_core/anndata.py	84.55% <100.00%> (-0.60%)	⬇️
anndata/_core/raw.py	79.28% <100.00%> (-4.29%)	⬇️
anndata/_io/__init__.py	100.00% <100.00%> (ø)
anndata/_core/aligned_df.py	97.77% <97.77%> (ø)

... and 7 files with indirect coverage changes