Add in-process FFI transport for Rust SDK #1627

Job	Run time
Rust SDK Tests (windows-latest, inprocess)	5m 38s
Rust SDK Tests (macos-latest, inprocess)	1h 1m 0s
Rust SDK Tests (ubuntu-latest, inprocess)	1h 0m 58s
Rust SDK Tests (windows-latest, default)	12m 51s
Rust SDK Bundled CLI Build (macos-latest)	1m 21s
Rust SDK Bundled CLI Build (windows-latest)	2m 4s
Rust SDK Tests (macos-latest, default)	8m 55s
Rust SDK Tests (ubuntu-latest, default)	6m 20s
Rust SDK Bundled CLI Build (ubuntu-latest)	58s
	2h 40m 5s

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