feat: add audio-translation feature

[bgrozev]

Add a new http://jitsi.org/protocol/audio-translation feature to Features.kt. No-op; defined to improve xmpp-caps statistics and avoid logs about unknown features.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 50.26%. Comparing base (07f847d) to head (7011037).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1293   +/-   ##
=======================================
  Coverage   50.25%   50.26%           
=======================================
  Files         130      130           
  Lines        8130     8131    +1     
  Branches     1253     1253           
=======================================
+ Hits         4086     4087    +1     
  Misses       3454     3454           
  Partials      590      590           

Files with missing lines	Coverage Δ
.../src/main/kotlin/org/jitsi/jicofo/xmpp/Features.kt	100.00% <100.00%> (ø)

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