Backport PR #3880 on branch 1.4.x (Fix: Extract some methods from FCLayers for easier inheritance)

[meeseeksmachine]

Backport PR #3880: Fix: Extract some methods from FCLayers for easier inheritance

[codecov]

Codecov Report

❌ Patch coverage is 96.29630% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 74.28%. Comparing base (19209f0) to head (fbc22ff).

Files with missing lines	Patch %	Lines
src/scvi/nn/_base_components.py	96.29%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            1.4.x    #3898      +/-   ##
==========================================
+ Coverage   74.23%   74.28%   +0.05%     
==========================================
  Files         231      231              
  Lines       23050    23064      +14     
==========================================
+ Hits        17112    17134      +22     
+ Misses       5938     5930       -8     

Flag	Coverage Δ
cuda	74.28% <96.29%> (?)
integration	74.25% <96.29%> (+0.01%)	⬆️

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Files with missing lines	Coverage Δ
src/scvi/nn/_base_components.py	94.79% <96.29%> (+0.26%)	⬆️

... and 4 files with indirect coverage changes

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