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 72.61%. Comparing base (5dacc67) to head (a2cbf80).

❗ There is a different number of reports uploaded between BASE (5dacc67) and HEAD (a2cbf80). Click for more details.

HEAD has 9 uploads less than BASE

Flag	BASE (5dacc67)	HEAD (a2cbf80)
integration	12	3

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #3702       +/-   ##
===========================================
- Coverage   88.53%   72.61%   -15.92%     
===========================================
  Files         237      237               
  Lines       23827    23834        +7     
===========================================
- Hits        21095    17308     -3787     
- Misses       2732     6526     +3794     

Flag	Coverage Δ
autotune	?
cuda	?
custom_dataloader	?
integration	72.61% <100.00%> (+<0.01%)	⬆️
internet	?
jax	?
macos	?
mlflow	?
nonjax	?
optional	?
private	?
resolution	?
windows	?

Flags with carried forward coverage won't be shown. Click here to find out more.

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

... and 86 files with indirect coverage changes

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[ori-kron-wis]

Only VAE has this change for now