RPC implementation + FFI #1351

Job	Run time
Build (x86_64-pc-windows-msvc)	7m 43s
Build (aarch64-pc-windows-msvc)	6m 39s
Build (x86_64-apple-darwin)	7m 15s
Build (aarch64-apple-darwin)	6m 7s
Build (aarch64-apple-ios)	8m 28s
Build (aarch64-apple-ios-sim)	5m 47s
Build (x86_64-unknown-linux-gnu)	4m 22s
Build (aarch64-unknown-linux-gnu)	5m 36s
Build (aarch64-linux-android)	3m 54s
Build (armv7-linux-androideabi)	3m 46s
Build (x86_64-linux-android)	3m 49s
	1h 3m 26s

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