Fix performance issue for fermion system#1712
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This PR fixes a performance issue in the auto-fermion system, in a simpler way than the previous PR #1709.
The fix is as @mtfishman suggested, with the
compute_permfactorfunction having a static inference issue that was making the construction of an MVector very slow.
The main changes here are:
compute_permfactorto be anNTupleso static inference succeedspermfactorfunctions to pass a tuple instead of splattingcompute_permfactoras backwards compatibility to code in ITensorNetworks/src/treetensornetworks/opsum_to_ttn/opsum_to_ttn.jl (https://github.com/ITensor/ITensorNetworks.jl/blob/4e59ab208d67f7f9bbc64bdc213b70278bbc6fe0/src/treetensornetworks/opsum_to_ttn/opsum_to_ttn.jl#L390)