WIP: DataChannel related utility functions #1453

Job	Run time
Build (x86_64-pc-windows-msvc)	7m 56s
Build (aarch64-pc-windows-msvc)	7m 14s
Build (x86_64-apple-darwin)	6m 34s
Build (aarch64-apple-darwin)	5m 46s
Build (aarch64-apple-ios)	7m 47s
Build (aarch64-apple-ios-sim)	5m 57s
Build (x86_64-unknown-linux-gnu)	3m 58s
Build (aarch64-unknown-linux-gnu)	13m 14s
Build (aarch64-linux-android)	4m 15s
Build (armv7-linux-androideabi)	3m 47s
Build (x86_64-linux-android)	3m 37s
	1h 10m 5s

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