Override VariantData.from_tree_sequence

[hyanwong]

Fixes #915

[mergify]

⚠️ The sha of the head commit of this PR conflicts with #960. Mergify cannot evaluate rules on this PR. ⚠️

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.17%. Comparing base (788d4df) to head (f8c62dc).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #961   +/-   ##
=======================================
  Coverage   93.17%   93.17%           
=======================================
  Files          18       18           
  Lines        6343     6346    +3     
  Branches     1134     1134           
=======================================
+ Hits         5910     5913    +3     
  Misses        294      294           
  Partials      139      139           

Flag	Coverage Δ
C	93.17% <100.00%> (+<0.01%)	⬆️
python	95.54% <100.00%> (+<0.01%)	⬆️

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[mergify]

⚠️ The sha of the head commit of this PR conflicts with #960. Mergify cannot evaluate rules on this PR. ⚠️