Allow adding JS callbacks in ChatInterface.button_properties

[ahuang11]

My use case is to download all messages

Screen.Recording.2024-04-10.at.1.28.29.PM.mov

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 37.05%. Comparing base (76c911a) to head (1127b7d).
Report is 21 commits behind head on main.

❗ Current head 1127b7d differs from pull request most recent head f282695. Consider uploading reports for the commit f282695 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6706      +/-   ##
==========================================
- Coverage   40.01%   37.05%   -2.97%     
==========================================
  Files         313      305       -8     
  Lines       46194    46048     -146     
==========================================
- Hits        18486    17062    -1424     
- Misses      27708    28986    +1278     

Flag	Coverage Δ
ui-tests	37.05% <100.00%> (-2.97%)	⬇️

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[philippjfr]

Test still failing.