Add bipartite specialization of belief propagation and gauging

[Yue-Zhengyuan]

This PR adds a specialized routine of belief propagation for bipartite iPEPS/iPEPO (2 x 2 unit cell with only 2 independent tensors). Accordingly, for simple update and belief propagation gauging, they now will check if the input state (and the BPEnv) is exactly bipartite, and if so, automatically use a specialized routine to exactly preserve the bipartite-ness.

The ultimate solution is tiledarray, but for now we don't have better choices.

[codecov]

Codecov Report

❌ Patch coverage is 98.03922% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/algorithms/bp/gaugefix.jl	91.66%	1 Missing ⚠️

Files with missing lines	Coverage Δ
src/algorithms/bp/beliefpropagation.jl	95.65% <100.00%> (+1.42%)	⬆️
src/algorithms/time_evolution/gaugefix_su.jl	90.32% <100.00%> (ø)
src/algorithms/time_evolution/simpleupdate.jl	97.70% <ø> (ø)
src/algorithms/time_evolution/time_evolve.jl	95.45% <100.00%> (+4.54%)	⬆️
src/algorithms/bp/gaugefix.jl	96.59% <91.66%> (-0.78%)	⬇️

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[Yue-Zhengyuan]

I tried not to do the useless update of the 2nd column before copying from the 1st column. But then constinferred of gauge_fix is broken.