[binary_tree_partition] [2/2]: Add binary_tree_partition

[LinjianMa]

Add

function binary_tree_partition(tn::ITensorNetwork, inds_btree::Vector)

Given an input tn and a rooted binary tree of indices, return a partition of tn with the same binary tree structure as inds_btree.

[codecov-commenter]

Codecov Report

Merging #64 (d69f17a) into main (3df4c84) will increase coverage by 0.70%.
The diff coverage is 98.92%.

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@@            Coverage Diff             @@
##             main      #64      +/-   ##
==========================================
+ Coverage   77.73%   78.44%   +0.70%     
==========================================
  Files          55       56       +1     
  Lines        2834     2927      +93     
==========================================
+ Hits         2203     2296      +93     
  Misses        631      631              

Impacted Files	Coverage Δ
src/ITensorNetworks.jl	77.77% <ø> (ø)
src/binary_tree_partition.jl	98.86% <98.86%> (ø)
src/mincut.jl	94.87% <100.00%> (+0.22%)	⬆️
src/itensornetwork.jl	86.20% <0.00%> (+0.86%)	⬆️

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[mtfishman]

Looks good, thanks!