[ITensors] Add checkflux debug check to factorize

[emstoudenmire]

Adds a call to checkflux at the beginning of factorize when debug checks are enabled.

Related to this forum discussion.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b8d28b5) 84.04% compared to head (417d745) 53.87%.

❗ Current head 417d745 differs from pull request most recent head 61d7b0e. Consider uploading reports for the commit 61d7b0e to get more accurate results

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Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1307       +/-   ##
===========================================
- Coverage   84.04%   53.87%   -30.18%     
===========================================
  Files         100       99        -1     
  Lines        8539     8488       -51     
===========================================
- Hits         7177     4573     -2604     
- Misses       1362     3915     +2553     

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[emstoudenmire]

@mtfishman please let me know if you think this is worth adding a unit test for.

[mtfishman]

Thanks! I think it would be good to add a simple unit test.

[mtfishman]

I'll just merge this, since checkflux is tested I don't think this needs a specialized test.