allow setting additional properties of streams through description.Session

[aler9]

No description provided.

[codecov]

Codecov Report

Merging #368 (4a482cf) into v4 (4e000eb) will decrease coverage by 0.02%.
The diff coverage is 86.29%.

@@            Coverage Diff             @@
##               v4     #368      +/-   ##
==========================================
- Coverage   84.76%   84.75%   -0.02%     
==========================================
  Files         101      101              
  Lines       10189    10193       +4     
==========================================
+ Hits         8637     8639       +2     
- Misses       1193     1194       +1     
- Partials      359      360       +1     

Files Changed	Coverage Δ
client.go	74.12% <72.09%> (+0.04%)	⬆️
pkg/description/media.go	91.44% <83.33%> (ø)
server_session.go	79.20% <90.90%> (ø)
pkg/description/session.go	91.83% <94.73%> (ø)
client_media.go	92.85% <100.00%> (ø)
server_conn.go	90.85% <100.00%> (+0.05%)	⬆️
server_session_media.go	94.71% <100.00%> (ø)
server_stream.go	85.56% <100.00%> (ø)
server_stream_media.go	90.62% <100.00%> (ø)

... and 1 file with indirect coverage changes

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