add audio service ducking default config

[emphasize]

Lately, audio service ducking was introduced to OpenVoiceOS/ovos-audio@0a3b034

This makes the audio service ducking the default configuration
("Audio service ducking" will be invalidated if "pulse_duck": true is configured, ie. pulse is taking over to perform said task.)

[codecov]

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[JarbasAl]

can we leave this as False by default for now? Kinda want the OCP sprint to be done before we change this, as i am introducing both "duck" and "cork" in there (volume change vs pause/unpause)

[codecov-commenter]

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Additional details and impacted files

@@          Coverage Diff          @@
##             dev     #82   +/-   ##
=====================================
  Coverage       ?   0.00%           
=====================================
  Files          ?      10           
  Lines          ?     810           
  Branches       ?       0           
=====================================
  Hits           ?       0           
  Misses         ?     810           
  Partials       ?       0           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

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