RPC implementation + FFI #1355

Job	Run time
Build (x86_64-pc-windows-msvc)	7m 21s
Build (aarch64-pc-windows-msvc)	6m 48s
Build (x86_64-apple-darwin)	7m 2s
Build (aarch64-apple-darwin)	6m 49s
Build (aarch64-apple-ios)	6m 22s
Build (aarch64-apple-ios-sim)	7m 50s
Build (x86_64-unknown-linux-gnu)	4m 8s
Build (aarch64-unknown-linux-gnu)	5m 26s
Build (aarch64-linux-android)	3m 48s
Build (armv7-linux-androideabi)	3m 52s
Build (x86_64-linux-android)	3m 44s
	1h 3m 10s

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