Implement, test polytomize_root

[mmore500]

trafficstars

As a public interface for _convert_node_to_root_polytomy

Closes #169

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 88.70%. Comparing base (0f46d43) to head (61f20ed).

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #194      +/-   ##
==========================================
+ Coverage   88.69%   88.70%   +0.01%     
==========================================
  Files         114      114              
  Lines       12830    12844      +14     
==========================================
+ Hits        11379    11393      +14     
  Misses       1451     1451              

Flag	Coverage Δ
unittests	88.70% <100.00%> (+0.01%)	:arrow_up:

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