feat: Silence detection

[bgrozev]

No description provided.

[JonathanLennox]

Would it be better to use an ID that syntactically cannot be used in colibri? (Is there one?)

[codecov]

Codecov Report

Merging #1926 (e270225) into master (42bc1b9) will increase coverage by 0.01%.
The diff coverage is 55.81%.

@@             Coverage Diff              @@
##             master    #1926      +/-   ##
============================================
+ Coverage     41.09%   41.10%   +0.01%     
+ Complexity     1709     1708       -1     
============================================
  Files           337      337              
  Lines         17415    17437      +22     
  Branches       2314     2318       +4     
============================================
+ Hits           7156     7167      +11     
- Misses         9568     9576       +8     
- Partials        691      694       +3     

Impacted Files	Coverage Δ
...rc/main/java/org/jitsi/videobridge/Conference.java	29.77% <25.00%> (ø)
.../jitsi/videobridge/message/BridgeChannelMessage.kt	62.89% <40.00%> (+0.07%)	⬆️
...rg/jitsi/videobridge/ConferenceSpeechActivity.java	63.04% <53.57%> (-4.16%)	⬇️
...itsi/videobridge/ConferenceSpeechActivityConfig.kt	100.00% <100.00%> (ø)

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