Rust

Optimize external directory path resolution and add benchmarks #391

Job	Run time
Format	7s
Async macOS	3m 2s
Async Linux	2m 7s
Blocking macOS	1m 55s
Blocking Linux	1m 15s
Async Windows	4m 50s
Blocking Windows	3m 48s
Semver Checks (Bubblewrap Base)	7s
Semver Checks (Bubblewrap Async)	9s
Semver Checks (Core Async)	16s
Semver Checks (Core Blocking)	14s
Semver Checks (Agents+Models)	12s
Semver Checks (Core Async+Linux)	17s
Semver Checks (Serdesai Full+Linux)	29s
Semver Checks (Serdesai Full)	23s
Semver Checks (Bubblewrap Blocking)	7s
Semver Checks (Models Blocking)	7s
Semver Checks (Core Blocking+Linux)	23s
publish-crate	0s
	19m 48s

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