Enabled several nb and poisson losses

[marie-minaeva]

Enabled multiple nb or poisson losses for, e.g nano-CUT&Tag data integration. Exposed early stopping patience argument in the train to users.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 16.97%. Comparing base (9ae238d) to head (a3b5bf0).
⚠️ Report is 16 commits behind head on main.

Files with missing lines	Patch %	Lines
src/multigrate/module/_multivae_torch.py	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #34      +/-   ##
==========================================
- Coverage   17.00%   16.97%   -0.04%     
==========================================
  Files          17       17              
  Lines         829      819      -10     
==========================================
- Hits          141      139       -2     
+ Misses        688      680       -8     

Files with missing lines	Coverage Δ
src/multigrate/model/_multivae.py	17.15% <ø> (-0.16%)	⬇️
src/multigrate/module/_multivae_torch.py	10.12% <0.00%> (ø)

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