Add mutation.edge for tsk_treeseq accessors.

[jeromekelleher]

Add Mutation.edge attribute

#685

[codecov]

Codecov Report

Merging #2279 (afd19b2) into main (9968e62) will increase coverage by 0.03%.
The diff coverage is 97.95%.

@@            Coverage Diff             @@
##             main    #2279      +/-   ##
==========================================
+ Coverage   93.30%   93.33%   +0.03%     
==========================================
  Files          27       27              
  Lines       26097    26134      +37     
  Branches     1175     1175              
==========================================
+ Hits        24349    24393      +44     
+ Misses       1718     1711       -7     
  Partials       30       30              

Flag	Coverage Δ
c-tests	92.31% <100.00%> (+0.08%)	⬆️
lwt-tests	89.05% <ø> (ø)
python-c-tests	71.88% <93.75%> (+0.01%)	⬆️
python-tests	98.88% <100.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
python/_tskitmodule.c	90.90% <92.30%> (-0.01%)	⬇️
c/tskit/tables.c	90.28% <100.00%> (+<0.01%)	⬆️
c/tskit/trees.c	95.29% <100.00%> (+0.29%)	⬆️
python/tskit/trees.py	98.05% <100.00%> (+<0.01%)	⬆️

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[jeromekelleher]

Bumping this, can I get a review please @benjeffery?

[benjeffery]

LGTM. I think the tables API always having an empty edge might be a bot of a gotcha, but I think it makes sense to do this.