RPC implementation + FFI #1375

Job	Run time
Build (x86_64-pc-windows-msvc)	7m 6s
Build (aarch64-pc-windows-msvc)	7m 59s
Build (x86_64-apple-darwin)	7m 37s
Build (aarch64-apple-darwin)	7m 19s
Build (aarch64-apple-ios)	9m 23s
Build (aarch64-apple-ios-sim)	5m 28s
Build (x86_64-unknown-linux-gnu)	4m 9s
Build (aarch64-unknown-linux-gnu)	5m 50s
Build (aarch64-linux-android)	3m 54s
Build (armv7-linux-androideabi)	3m 44s
Build (x86_64-linux-android)	3m 47s
	1h 6m 16s

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