Throttle updates to Boolean indicators

[philippjfr]

When working in a template the loading spinner is continuously updated to the point that it dominates Websocket traffic for many apps. By implementing simple throttling for boolean indicator events we can avoid a lot of that traffic and reduce the flicker of the indicator itself.

[codecov]

Codecov Report

Attention: Patch coverage is 40.00000% with 27 lines in your changes are missing coverage. Please review.

Project coverage is 82.07%. Comparing base (5578f98) to head (e674a76).
Report is 1174 commits behind head on main.

Files	Patch %	Lines
panel/widgets/indicators.py	40.00%	27 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6481      +/-   ##
==========================================
- Coverage   82.75%   82.07%   -0.68%     
==========================================
  Files         239      312      +73     
  Lines       34507    46096   +11589     
==========================================
+ Hits        28555    37832    +9277     
- Misses       5952     8264    +2312     

Flag	Coverage Δ
ui-tests	36.65% <22.22%> (-1.47%)	⬇️
unitexamples-tests	71.48% <40.00%> (-2.37%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

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