DMRG Callback

[emstoudenmire]

This PR fixes two issues (can split if better):

1. updates the OpSum to TTN code to call the new permfactor interface of the auto fermion system, as updated in Optimization for fermion system ITensors.jl#1709
2. Allows passing a sweep_callback to the dmrg and eigsolve functions

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.45%. Comparing base (7e4c461) to head (5d3749c).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #304      +/-   ##
==========================================
+ Coverage   71.43%   71.45%   +0.02%     
==========================================
  Files          81       81              
  Lines        4029     4029              
==========================================
+ Hits         2878     2879       +1     
+ Misses       1151     1150       -1     

Flag	Coverage Δ
docs	36.57% <100.00%> (+0.07%)	⬆️

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[emstoudenmire]

I think tests are failing because ITensor/ITensors.jl#1709 isn't merged.

[mtfishman]

I think tests are failing because ITensor/ITensors.jl#1709 isn't merged.

Yes, though see my comment ITensor/ITensors.jl#1709 (comment) about how we should try to design that PR so it doesn't break ITensorNetworks.jl.

[mtfishman]

@emstoudenmire can you remove the auto fermion update from this PR and just include the callback fix?

[mtfishman]

I reverted the change to compute_permfactor. @emstoudenmire can you add a regression test for this? Besides that I'm fine with merging this.

[emstoudenmire]

Just added the regression test and increased the version number