Add Internal model

[moinfar]

This model has capabilities not ported to scvi-tools

[codecov]

Codecov Report

❌ Patch coverage is 91.91617% with 27 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.61%. Comparing base (be7bd11) to head (347965c).

Files with missing lines	Patch %	Lines
src/drvi/internal/drvi/_module.py	81.41%	21 Missing ⚠️
src/drvi/internal/drvi/_base_components.py	90.00%	5 Missing ⚠️
src/drvi/internal/drvi/_metrics.py	98.91%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #135      +/-   ##
==========================================
+ Coverage   79.49%   83.61%   +4.12%     
==========================================
  Files          15       23       +8     
  Lines         668     1001     +333     
==========================================
+ Hits          531      837     +306     
- Misses        137      164      +27     

Files with missing lines	Coverage Δ
src/drvi/__init__.py	100.00% <100.00%> (ø)
src/drvi/internal/__init__.py	100.00% <100.00%> (ø)
src/drvi/internal/drvi/__init__.py	100.00% <100.00%> (ø)
src/drvi/internal/drvi/_generative_mixin.py	100.00% <100.00%> (ø)
src/drvi/internal/drvi/_model.py	100.00% <100.00%> (ø)
src/drvi/internal/drvi/_trainingplan.py	100.00% <100.00%> (ø)
src/drvi/internal/drvi/_metrics.py	98.91% <98.91%> (ø)
src/drvi/internal/drvi/_base_components.py	90.00% <90.00%> (ø)
src/drvi/internal/drvi/_module.py	81.41% <81.41%> (ø)

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