Add in-process FFI transport for Rust SDK #1695

Job	Run time
Rust SDK Tests (ubuntu-latest, inprocess)	12m 49s
Rust SDK Tests (ubuntu-latest, default)	9m 39s
Rust SDK Tests (macos-latest, default)	9m 11s
Rust SDK Bundled CLI Build (windows-latest)	4m 17s
Rust SDK Tests (windows-latest, default)	13m 51s
Rust SDK Tests (macos-latest, inprocess)	13m 24s
Rust SDK Bundled CLI Build (ubuntu-latest)	2m 52s
Rust SDK Bundled CLI Build (macos-latest)	3m 43s
	1h 9m 46s

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