Forward rtcStatsEnabled to Jibri invite

[bgrozev]

When jicofo invites a Jibri instance, include the conference-level rtcStatsEnabled flag in the start IQ.

• JibriSession accepts and forwards the flag via JibriIq.setRtcStatsEnabled()
• JibriRecorder and JibriSipGateway read the flag from conference.isRtcStatsEnabled

Depends on jitsi/jitsi-xmpp-extensions#138.

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 26.19%. Comparing base (a095944) to head (e4369a2).

Files with missing lines	Patch %	Lines
...ain/kotlin/org/jitsi/jicofo/jibri/JibriRecorder.kt	0.00%	1 Missing ⚠️
...n/kotlin/org/jitsi/jicofo/jibri/JibriSipGateway.kt	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1283      +/-   ##
============================================
+ Coverage     26.18%   26.19%   +0.01%     
  Complexity      468      468              
============================================
  Files           126      126              
  Lines          7871     7875       +4     
  Branches       1215     1215              
============================================
+ Hits           2061     2063       +2     
- Misses         5497     5499       +2     
  Partials        313      313              

Files with missing lines	Coverage Δ
...main/java/org/jitsi/jicofo/jibri/JibriSession.java	41.84% <100.00%> (+0.49%)	⬆️
...ain/kotlin/org/jitsi/jicofo/jibri/JibriRecorder.kt	8.82% <0.00%> (-0.14%)	⬇️
...n/kotlin/org/jitsi/jicofo/jibri/JibriSipGateway.kt	16.07% <0.00%> (-0.30%)	⬇️

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