Add opaque `metadata` passthrough to SDK tool definitions #1744

Job	Run time
Rust SDK Bundled CLI Build (windows-latest)	3m 45s
Rust SDK Bundled CLI Build (ubuntu-latest)	3m 8s
Rust SDK Tests (ubuntu-latest, default)	8m 20s
Rust SDK Bundled CLI Build (macos-latest)	2m 14s
Rust SDK Tests (ubuntu-latest, inprocess)	13m 46s
Rust SDK Tests (macos-latest, inprocess)	13m 46s
Rust SDK Tests (macos-latest, default)	5m 15s
Rust SDK Tests (windows-latest, default)	12m 33s
	1h 2m 47s

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