Feat: Asymmetric n_layers for encoder/decoder

[ori-kron-wis]

close #3698

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.94%. Comparing base (7901963) to head (ee6b80c).

❗ There is a different number of reports uploaded between BASE (7901963) and HEAD (ee6b80c). Click for more details.

HEAD has 20 uploads less than BASE

Flag	BASE (7901963)	HEAD (ee6b80c)
	23	3

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #3702       +/-   ##
===========================================
- Coverage   88.43%   72.94%   -15.50%     
===========================================
  Files         226      226               
  Lines       21909    21916        +7     
===========================================
- Hits        19375    15986     -3389     
- Misses       2534     5930     +3396     

Files with missing lines	Coverage Δ
src/scvi/module/_vae.py	96.61% <100.00%> (+0.09%)	⬆️

... and 80 files with indirect coverage changes

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[ori-kron-wis]

Only VAE has this change for now