Make block sparse SVD more generic

[mtfishman]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 78.57143% with 6 lines in your changes missing coverage. Please review.

Project coverage is 74.98%. Comparing base (311f391) to head (15f1f23).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/factorizations/tensorproducts.jl	50.00%	5 Missing ⚠️
src/blocksparsearrayinterface/getunstoredblock.jl	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #147      +/-   ##
==========================================
- Coverage   75.15%   74.98%   -0.17%     
==========================================
  Files          35       36       +1     
  Lines        1827     1835       +8     
==========================================
+ Hits         1373     1376       +3     
- Misses        454      459       +5     

Flag	Coverage Δ
docs	7.53% <14.28%> (-0.04%)	⬇️

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