RPC implementation + FFI #1371

Job	Run time
Build (x86_64-pc-windows-msvc)	6m 39s
Build (aarch64-pc-windows-msvc)	7m 9s
Build (x86_64-apple-darwin)	6m 24s
Build (aarch64-apple-darwin)	8m 23s
Build (aarch64-apple-ios)	5m 46s
Build (aarch64-apple-ios-sim)	7m 31s
Build (x86_64-unknown-linux-gnu)	4m 12s
Build (aarch64-unknown-linux-gnu)	6m 12s
Build (aarch64-linux-android)	3m 46s
Build (armv7-linux-androideabi)	3m 51s
Build (x86_64-linux-android)	3m 38s
	1h 3m 31s

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