Support Arrow tables as inputs for adding item attributes

[mdekstrand]

This updates DatasetBuilder.add_scalar_attribute to support loading attributes from PyArrow tables.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.64%. Comparing base (a4c466b) to head (d041675).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1109   +/-   ##
=======================================
  Coverage   89.63%   89.64%           
=======================================
  Files         250      250           
  Lines       16833    16836    +3     
=======================================
+ Hits        15089    15092    +3     
  Misses       1744     1744           

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

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.