RPC implementation + FFI #1362

Job	Run time
Build (x86_64-pc-windows-msvc)	6m 57s
Build (aarch64-pc-windows-msvc)	7m 15s
Build (x86_64-apple-darwin)	8m 48s
Build (aarch64-apple-darwin)	6m 39s
Build (aarch64-apple-ios)	6m 14s
Build (aarch64-apple-ios-sim)	7m 16s
Build (x86_64-unknown-linux-gnu)	4m 3s
Build (aarch64-unknown-linux-gnu)	6m 4s
Build (aarch64-linux-android)	3m 48s
Build (armv7-linux-androideabi)	4m 10s
Build (x86_64-linux-android)	3m 52s
	1h 5m 6s

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