python: add in-process (FFI) transport (#1975) #1717

Job	Run time
Rust SDK Tests (macos-latest, inprocess)	13m 51s
Rust SDK Bundled CLI Build (windows-latest)	4m 20s
Rust SDK Tests (macos-latest, default)	7m 47s
Rust SDK Tests (ubuntu-latest, inprocess)	12m 53s
Rust SDK Tests (windows-latest, default)	13m 26s
Rust SDK Bundled CLI Build (ubuntu-latest)	2m 30s
Rust SDK Bundled CLI Build (macos-latest)	2m 19s
Rust SDK Tests (ubuntu-latest, default)	9m 46s
	1h 6m 52s

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