RPC implementation + FFI #1350

Job	Run time
Build (x86_64-pc-windows-msvc)	7m 26s
Build (aarch64-pc-windows-msvc)	7m 47s
Build (x86_64-apple-darwin)	8m 19s
Build (aarch64-apple-darwin)	7m 54s
Build (aarch64-apple-ios)	6m 1s
Build (aarch64-apple-ios-sim)	7m 49s
Build (x86_64-unknown-linux-gnu)	4m 11s
Build (aarch64-unknown-linux-gnu)	5m 29s
Build (aarch64-linux-android)	4m 3s
Build (armv7-linux-androideabi)	4m 0s
Build (x86_64-linux-android)	3m 54s
	1h 6m 53s

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