Pass the extras bundle to the playFromMediaId instead of null

[dgiannakop]

When setting the extras on the description of a MediaItem we expect the same bundle to be passed along on playFromMediaId.

Correct me if I am wrong, but that is the behaviour we observe on the android automotive and android auto and wanted to make it consistent.

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[dgiannakop]

@googlebot I signed it!

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[fllaryora]

I tested It and When I receive it on a MediaLibrarySession.Callback the method onAddMediaItems I find the extras of the requestedMetadata of the media empty

If I want to try something like: https://developer.android.com/guide/components/intents-common#PlaySearch

adb shell am start -n com.example.android.mediacontroller/.MediaAppControllerActivity --es com.example.android.mediacontroller.SEARCH "jazz?"  --es android.intent.extra.focus "vnd.android.cursor.item/genre" --es android.intent.extra.genre "jazz"

The rest of the extras are vanished.