server: stop sending multicast packets when all multicast readers have disconnected

[aler9]

No description provided.

[codecov]

Codecov Report

Merging #411 (f9c8c08) into main (d273452) will increase coverage by 0.03%.
The diff coverage is 90.32%.

@@            Coverage Diff             @@
##             main     #411      +/-   ##
==========================================
+ Coverage   84.13%   84.16%   +0.03%     
==========================================
  Files         100      100              
  Lines       10437    10433       -4     
==========================================
  Hits         8781     8781              
+ Misses       1270     1267       -3     
+ Partials      386      385       -1     

Files Changed	Coverage Δ
server_stream_media.go	75.67% <ø> (+2.34%)	⬆️
server_stream.go	85.71% <78.57%> (+0.23%)	⬆️
server_session.go	78.64% <100.00%> (+0.02%)	⬆️

... and 3 files with indirect coverage changes

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