RPC implementation + FFI #1378

Job	Run time
Build (x86_64-pc-windows-msvc)	7m 32s
Build (aarch64-pc-windows-msvc)	7m 50s
Build (x86_64-apple-darwin)	7m 52s
Build (aarch64-apple-darwin)	8m 4s
Build (aarch64-apple-ios)	6m 4s
Build (aarch64-apple-ios-sim)	10m 20s
Build (x86_64-unknown-linux-gnu)	4m 0s
Build (aarch64-unknown-linux-gnu)	5m 34s
Build (aarch64-linux-android)	3m 51s
Build (armv7-linux-androideabi)	3m 58s
Build (x86_64-linux-android)	3m 50s
	1h 8m 55s

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