feat: fast SHAP approximation

[ori-kron-wis]

updates in shap

[codecov]

Codecov Report

Attention: Patch coverage is 70.22587% with 145 lines in your changes missing coverage. Please review.

Project coverage is 79.91%. Comparing base (9396c33) to head (81ceb79).

Files with missing lines	Patch %	Lines
src/scvi/utils/fastshap/surrogate.py	52.58%	101 Missing ⚠️
src/scvi/utils/fastshap/fastshap.py	78.74%	44 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3243      +/-   ##
==========================================
- Coverage   80.18%   79.91%   -0.28%     
==========================================
  Files         193      197       +4     
  Lines       17082    17569     +487     
==========================================
+ Hits        13698    14040     +342     
- Misses       3384     3529     +145     

Files with missing lines	Coverage Δ
src/scvi/utils/__init__.py	100.00% <100.00%> (ø)
src/scvi/utils/fastshap/__init__.py	100.00% <100.00%> (ø)
src/scvi/utils/fastshap/utils.py	100.00% <100.00%> (ø)
src/scvi/utils/fastshap/fastshap.py	78.74% <78.74%> (ø)
src/scvi/utils/fastshap/surrogate.py	52.58% <52.58%> (ø)

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