Working ContractNetwork

[JoeyT1994]

This PR introduces the ability to contract vectors of AbstractArrays and thus AbstractTensorNetworks via the contractnetwork(tn; sequence) function.

The sequence is used to tell the contraction_sequence backend how to find the desired sequence, with the strings sequence= "leftassociative" and "optimal" supported (the latter via TensorOperations) alongside support for sending a specific pre-defined sequence.

Rudimentary tests are included, although we might want to consider making these more robust and also testing the sequence finding functionality ourselves.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 26 lines in your changes missing coverage. Please review.
✅ Project coverage is 0.00%. Comparing base (3549a9c) to head (7a2a24c).

Files with missing lines	Patch %	Lines
src/contractnetwork.jl	0.00%	21 Missing ⚠️
...tionsExt/ITensorNetworksNextTensorOperationsExt.jl	0.00%	5 Missing ⚠️

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HEAD has 6 uploads less than BASE

Flag	BASE (3549a9c)	HEAD (7a2a24c)
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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #7       +/-   ##
==========================================
- Coverage   34.85%   0.00%   -34.86%     
==========================================
  Files           3       4        +1     
  Lines         175     195       +20     
==========================================
- Hits           61       0       -61     
- Misses        114     195       +81     

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

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[github-actions]

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[JoeyT1994]

@mtfishman I'm not really sure what the failing test is to do with... something coming from Aqua.jl and stale dependencies...

[mtfishman]

@mtfishman I'm not really sure what the failing test is to do with... something coming from Aqua.jl and stale dependencies...

It looks like moving the TensorOperations code to a package extension made it so that ITensorBase is no longer a direct dependency of ITensorNetworksNext, since now it is only used in that package extension (Aqua is rightly detecting that situation and seeing that there is a dependency listed in the Project.toml that isn't being used in the main package).

However, in this case I think we should try to use NamedDimsArrays directly rather than ITensorBase, I can give you pointers on how to do that.