Implements extended API for creating `RtcRtpTransceivers` #1669

Job	Run time
clippy (linux)	5m 2s
dartfmt	1m 5s
ktfmt	11s
clippy (macos)	5m 9s
clippy (windows)	5m 38s
dartanalyze	1m 28s
rustfmt	14s
swiftformat	19s
build (macos)	6m 19s
build (linux)	8m 44s
build (windows)	7m 9s
rustdoc (linux)	4m 3s
rustdoc (macos)	5m 15s
rustdoc (windows)	8m 2s
test (example, ${{ matrix.platform }})	0s
pr	0s
dart pub publish (pub.dev)	0s
release (GitHub)	0s
	58m 38s

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