Adding merge nbhd code

[cgt3]

Code for computing merge neighborhoods using volume scores.

[codecov[bot]]

Codecov Report

Merging #48 (48ffdd5) into main (9051c34) will decrease coverage by 3.28%. The diff coverage is 0.00%.

:exclamation: Current head 48ffdd5 differs from pull request most recent head 0e3573b. Consider uploading reports for the commit 0e3573b to get more accurate results

@@            Coverage Diff             @@
##             main      #48      +/-   ##
==========================================
- Coverage   97.64%   94.36%   -3.29%     
==========================================
  Files          19       20       +1     
  Lines        1955     2023      +68     
==========================================
  Hits         1909     1909              
- Misses         46      114      +68     

Impacted Files	Coverage Δ
src/merge_neighborhoods.jl	0.00% <0.00%> (ø)

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