Rust

Optimize external directory path resolution and add benchmarks #389

Job	Run time
Format	4s
Async Linux	2m 45s
Async macOS	2m 13s
Blocking Linux	1m 13s
Blocking Windows	3m 4s
Blocking macOS	2m 2s
Async Windows	4m 21s
Semver Checks (Core Async+Linux)	19s
Semver Checks (Serdesai Full)	28s
Semver Checks (Bubblewrap Blocking)	11s
Semver Checks (Core Blocking)	25s
Semver Checks (Bubblewrap Async)	6s
Semver Checks (Core Async)	21s
Semver Checks (Models Blocking)	6s
Semver Checks (Bubblewrap Base)	11s
Semver Checks (Core Blocking+Linux)	31s
Semver Checks (Serdesai Full+Linux)	29s
Semver Checks (Agents+Models)	13s
publish-crate	-1s
	19m 1s

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