Wrap Tokio types in a configurable runtime #1018

Job	Run time
Build (x86_64-pc-windows-msvc)	7m 25s
Build (aarch64-pc-windows-msvc)	7m 33s
Build (x86_64-apple-darwin)	9m 16s
Build (aarch64-apple-darwin)	9m 54s
Build (aarch64-apple-ios)	9m 18s
Build (aarch64-apple-ios-sim)	9m 7s
Build (x86_64-unknown-linux-gnu)	4m 4s
Build (aarch64-unknown-linux-gnu)	5m 30s
Build (aarch64-linux-android)	3m 32s
Build (armv7-linux-androideabi)	3m 55s
Build (x86_64-linux-android)	3m 29s
	1h 13m 3s

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