RPC implementation + FFI #1359

Job	Run time
Build (x86_64-pc-windows-msvc)	6m 39s
Build (aarch64-pc-windows-msvc)	6m 58s
Build (x86_64-apple-darwin)	5m 53s
Build (aarch64-apple-darwin)	6m 38s
Build (aarch64-apple-ios)	5m 57s
Build (aarch64-apple-ios-sim)	8m 1s
Build (x86_64-unknown-linux-gnu)	4m 2s
Build (aarch64-unknown-linux-gnu)	5m 37s
Build (aarch64-linux-android)	3m 44s
Build (armv7-linux-androideabi)	3m 56s
Build (x86_64-linux-android)	3m 52s
	1h 1m 17s

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