MusicTrackListener: Get currently playing song asynchronously

Fixes #10339.
3 jobs for music in 4 minutes and 26 seconds (queued for 1 minute and 7 seconds)
Status Job ID Name Coverage
  Test
passed #20038
run-appdata

00:00:08

passed #20037
run-tests

00:03:45

 
  Build
passed #20039
run-build

00:00:33