RPC implementation + FFI #1380

Job	Run time
Build (x86_64-pc-windows-msvc)	8m 19s
Build (aarch64-pc-windows-msvc)	7m 34s
Build (x86_64-apple-darwin)	13m 41s
Build (aarch64-apple-darwin)	8m 34s
Build (aarch64-apple-ios)	7m 49s
Build (aarch64-apple-ios-sim)	9m 9s
Build (x86_64-unknown-linux-gnu)	4m 9s
Build (aarch64-unknown-linux-gnu)	6m 19s
Build (aarch64-linux-android)	4m 27s
Build (armv7-linux-androideabi)	3m 46s
Build (x86_64-linux-android)	3m 44s
	1h 17m 31s

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