Introduce binary_tree_structure, path_graph_structure, and rename binary_tree_partition

[LinjianMa]

Introduce APIs below as is discussed in #66:

"""
Outputs a maximimally unbalanced directed binary tree DataGraph defining the desired graph structure
"""
function path_graph_structure(tn::ITensorNetwork)
end

"""
Outputs a directed binary tree DataGraph defining the desired graph structure
"""
function binary_tree_structure(tn::ITensorNetwork)
end

function partition(
  ::Algorithm"mincut_recursive_bisection", tn::ITensorNetwork, inds_btree::DataGraph
)

function partition(tn::ITensorNetwork, inds_btree::DataGraph; alg::String)
  return partition(Algorithm(alg), tn, inds_btree)
end

[codecov-commenter]

Codecov Report

Merging #69 (7978e6b) into main (d197854) will increase coverage by 0.32%.
The diff coverage is 93.65%.

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@@            Coverage Diff             @@
##             main      #69      +/-   ##
==========================================
+ Coverage   75.83%   76.16%   +0.32%     
==========================================
  Files          56       56              
  Lines        2918     2970      +52     
==========================================
+ Hits         2213     2262      +49     
- Misses        705      708       +3     

Impacted Files	Coverage Δ
src/mincut.jl	94.44% <90.32%> (-0.43%)	⬇️
src/binary_tree_partition.jl	98.23% <96.87%> (-0.64%)	⬇️

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[mtfishman]

Over all this looks good, glad to see that changing the data structure didn't change much and I like the path_graph_structure and binary_tree_structure interface.