`AudioDeviceModule` multi `AudioSource` rework #1661

Job	Run time
build (linux)	6m 31s
build (macos)	15m 49s
clippy (linux)	3m 58s
dartanalyze	1m 29s
build (windows)	11m 34s
clippy (macos)	6m 54s
clippy (windows)	9m 39s
dartfmt	53s
ktfmt	12s
rustdoc (linux)	3m 52s
rustdoc (macos)	7m 26s
rustfmt	17s
swiftformat	26s
rustdoc (windows)	9m 10s
test (example, ${{ matrix.platform }})	0s
pr	0s
dart pub publish (pub.dev)	0s
release (GitHub)	0s
	1h 18m 10s

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