feat: add support for ManagedMediaSource startstreaming and endstream… #3195

Job	Run time
test-type-matrix	1s
should-skip	5s
ci (ubuntu-latest, unit)	2m 22s
ci (ubuntu-latest, playback)	1m 59s
ci (ubuntu-latest, playback-min)	2m 21s
ci (ubuntu-latest, coverage)	4m 9s
	10m 57s

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