Add PingEvent, PongEvent, TranscriptionResultEvent to MediaJson.

[bgrozev]

• feat: Add PingEvent and PongEvent.
• Add TranscriptionResultEvent.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 34.02%. Comparing base (9e95588) to head (75779e7).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #225      +/-   ##
============================================
- Coverage     34.51%   34.02%   -0.50%     
  Complexity      162      162              
============================================
  Files            36       36              
  Lines          1437     1358      -79     
  Branches        136      136              
============================================
- Hits            496      462      -34     
+ Misses          908      863      -45     
  Partials         33       33              

Files with missing lines	Coverage Δ
...n/src/main/kotlin/org/jitsi/mediajson/MediaJson.kt	100.00% <100.00%> (ø)

... and 18 files with indirect coverage changes

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