Add in-process FFI transport for Rust SDK #1694

Job	Run time
Rust SDK Tests (ubuntu-latest, default)	3m 23s
Rust SDK Tests (windows-latest, default)	3m 22s
Rust SDK Tests (macos-latest, inprocess)	3m 27s
Rust SDK Tests (ubuntu-latest, inprocess)	3m 25s
Rust SDK Tests (macos-latest, default)	3m 30s
Rust SDK Bundled CLI Build (macos-latest)	2m 49s
Rust SDK Bundled CLI Build (ubuntu-latest)	2m 29s
Rust SDK Bundled CLI Build (windows-latest)	3m 23s
	25m 48s

Provide feedback