Implements extended API for creating `RtcRtpTransceivers` #1691

Job	Run time
clippy (linux)	4m 6s
build (macos)	1s
build (linux)	5m 22s
clippy (macos)	1s
dartanalyze	1m 8s
build (windows)	11m 36s
clippy (windows)	7m 20s
dartfmt	1m 2s
ktfmt	16s
rustdoc (linux)	4m 39s
rustdoc (macos)	1s
rustfmt	18s
rustdoc (windows)	8m 3s
swiftformat	1s
test (example, ${{ matrix.platform }})	1s
pr	1s
dart pub publish (pub.dev)	1s
release (GitHub)	1s
	43m 58s

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