Restore support for parameters as vectors

[emstoudenmire]

This PR adds back support for parameters (passed via factorize_kwargs) such as cutoff and maxdim to be allowed to be vectors, interpreted as the value to use at each sweep. Also tests are added for this feature. @jack-dunham

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.70%. Comparing base (afd15c3) to head (de76072).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #263      +/-   ##
==========================================
+ Coverage   68.51%   68.70%   +0.19%     
==========================================
  Files          81       81              
  Lines        4005     4007       +2     
==========================================
+ Hits         2744     2753       +9     
+ Misses       1261     1254       -7     

Flag	Coverage Δ
docs	0.00% <0.00%> (ø)

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