Handling release of a MediaSessionCompat

[valeriia-shchukina]

MediaSession is supposed to be released in case the media application has crashed while being connected to a MediaController. If the MediaController doesn't handle the onSessionDestroyed() it's possible that the old media session and old TransportControls are reused, which would result in a broken state.

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[valeriia-shchukina]

I signed it!

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CLAs look good, thanks!

[nic0lette]

Thank you for the contribution!