RPC implementation + FFI #1376

Job	Run time
Build (x86_64-pc-windows-msvc)	6m 46s
Build (aarch64-pc-windows-msvc)	6m 52s
Build (x86_64-apple-darwin)	7m 21s
Build (aarch64-apple-darwin)	11m 32s
Build (aarch64-apple-ios)	6m 27s
Build (aarch64-apple-ios-sim)	9m 42s
Build (x86_64-unknown-linux-gnu)	4m 5s
Build (aarch64-unknown-linux-gnu)	5m 50s
Build (aarch64-linux-android)	4m 9s
Build (armv7-linux-androideabi)	3m 50s
Build (x86_64-linux-android)	3m 47s
	1h 10m 21s

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