feat: from-sdist for overrides

[henryiii]

Close #766.

Will make sure it works for something like pybind11 first. Will need one more thing, so making this a followup.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.20%. Comparing base (2b3e4d2) to head (e25fe40).
Report is 70 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #812      +/-   ##
==========================================
+ Coverage   83.18%   83.20%   +0.02%     
==========================================
  Files          73       73              
  Lines        4068     4073       +5     
==========================================
+ Hits         3384     3389       +5     
  Misses        684      684              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.