Limit video senders

[jqdrqgnq]

Keep track of the number of video senders in a conference, that is, the number of participants who have unmuted their video source. When the limit is reached, return an error if another participant attempts to unmute their video.

This is an attempt to avoid issues that may arise from the storm of signaling that may occur when a large number of participants unmute at the same time.

[codecov]

Codecov Report

Merging #827 (fb9e5b8) into master (931b95a) will decrease coverage by 0.36%.
The diff coverage is 6.66%.

@@             Coverage Diff              @@
##             master     #827      +/-   ##
============================================
- Coverage     44.90%   44.53%   -0.37%     
+ Complexity      756      752       -4     
============================================
  Files           111      111              
  Lines          6527     6572      +45     
  Branches        920      928       +8     
============================================
- Hits           2931     2927       -4     
- Misses         3188     3233      +45     
- Partials        408      412       +4     

Impacted Files	Coverage Δ
...a/org/jitsi/impl/protocol/xmpp/ChatMemberImpl.java	0.00% <0.00%> (ø)
...ava/org/jitsi/impl/protocol/xmpp/ChatRoomImpl.java	0.00% <0.00%> (ø)
...itsi/jicofo/conference/source/EndpointSourceSet.kt	78.26% <0.00%> (-1.74%)	⬇️
...tlin/org/jitsi/jicofo/xmpp/muc/ChatRoomListener.kt	33.33% <0.00%> (-4.17%)	⬇️
...tsi/jicofo/conference/JitsiMeetConferenceImpl.java	43.87% <7.69%> (-0.74%)	⬇️
...c/main/kotlin/org/jitsi/jicofo/ConferenceConfig.kt	92.85% <100.00%> (+0.35%)	⬆️
...si/jicofo/conference/AbstractChannelAllocator.java	39.08% <0.00%> (-3.45%)	⬇️
...itsi/protocol/xmpp/AbstractOperationSetJingle.java	54.18% <0.00%> (-1.68%)	⬇️
...rc/main/kotlin/org/jitsi/jicofo/jibri/BaseJibri.kt	0.00% <0.00%> (ø)

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