Debounce change events

[andrewsayre]

Description:

Some devices may send multiple events of the same type in a short time span AND may not be fully ready to respond when they are issued. This ensures that EVENT_SOURCES_CHANGED, EVENT_PLAYERS_CHANGED, EVENT_GROUPS_CHANGED, EVENT_USER_CHANGED are debounced with a 1 sec delay.

Checklist:

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• Tests have been added/updated. No exclusions in .coveragerc permitted.
• README.MD updated (if necessary)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (7715efc) to head (0111048).
Report is 2 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff            @@
##               dev      #117   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           24        24           
  Lines         2141      2158   +17     
=========================================
+ Hits          2141      2158   +17     

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