Support cryptex.

[JonathanLennox]

Supports draft-ietf-avtcore-cryptex. Part of a package with jitsi/jitsi-srtp#29, jitsi/lib-jitsi-meet#2150, and jitsi/jitsi-xmpp-extensions#87.

[codecov]

Codecov Report

Merging #1969 (c80753a) into master (f6426ea) will decrease coverage by 0.08%.
The diff coverage is 18.57%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1969      +/-   ##
============================================
- Coverage     43.10%   43.02%   -0.08%     
+ Complexity     1668     1667       -1     
============================================
  Files           322      323       +1     
  Lines         16691    16721      +30     
  Branches       2192     2200       +8     
============================================
+ Hits           7194     7195       +1     
- Misses         8788     8824      +36     
+ Partials        709      702       -7     

Impacted Files	Coverage Δ
...m/src/main/kotlin/org/jitsi/nlj/RtpReceiverImpl.kt	0.00% <0.00%> (ø)
...sform/src/main/kotlin/org/jitsi/nlj/Transceiver.kt	0.00% <0.00%> (ø)
...n/kotlin/org/jitsi/nlj/transform/node/RtpParser.kt	0.00% <0.00%> (ø)
...si/nlj/transform/node/incoming/AudioLevelReader.kt	0.00% <0.00%> (ø)
...nsform/src/main/kotlin/org/jitsi/nlj/PacketInfo.kt	28.57% <25.00%> (+0.21%)	⬆️
.../jitsi/videobridge/transport/dtls/DtlsTransport.kt	34.14% <33.33%> (-0.04%)	⬇️
.../src/main/kotlin/org/jitsi/videobridge/Endpoint.kt	20.30% <40.00%> (-0.11%)	⬇️
...c/main/kotlin/org/jitsi/videobridge/relay/Relay.kt	18.03% <40.00%> (+0.05%)	⬆️
...orm/src/main/kotlin/org/jitsi/nlj/srtp/SrtpUtil.kt	54.54% <100.00%> (+0.37%)	⬆️
...ransform/node/incoming/RemoteBandwidthEstimator.kt	70.17% <100.00%> (ø)
... and 9 more

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[JonathanLennox]

I marked this as "ready for review" but we still need the AudioLevelReader split.

[bgrozev]

I think this should be && now? Otherwise it's just equivalent to the config value. The semantics of Endpoint.cryptex is "whether we should use cryptex when encrypting", right?