Remove ITensorMPS.jl dependency

[mtfishman]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 76.92308% with 9 lines in your changes missing coverage. Please review.

Project coverage is 77.86%. Comparing base (7023120) to head (0ac8b57).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/abstractitensornetwork.jl	81.81%	2 Missing ⚠️
src/inner.jl	66.66%	2 Missing ⚠️
...rc/treetensornetworks/abstracttreetensornetwork.jl	66.66%	2 Missing ⚠️
src/expect.jl	83.33%	1 Missing ⚠️
src/treetensornetworks/projttns/abstractprojttn.jl	0.00%	1 Missing ⚠️
src/treetensornetworks/projttns/projttnsum.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #224      +/-   ##
==========================================
- Coverage   82.43%   77.86%   -4.58%     
==========================================
  Files          78       76       -2     
  Lines        3695     3677      -18     
==========================================
- Hits         3046     2863     -183     
- Misses        649      814     +165     

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

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[mtfishman]

I added back some uses of ITensorMPS.jl to the DMRG and OpSum to MPO/TTNO tests where it will require some nontrivial work to remove them, but besides that ITensorMPS.jl is removed from the library.

[JoeyT1994]

Looks good to merge to me! Thanks Matt, nice to see code being deleted.