Add opaque `metadata` passthrough to SDK tool definitions #1741

Job	Run time
Rust SDK Bundled CLI Build (macos-latest)	2m 50s
Rust SDK Tests (macos-latest, default)	7m 52s
Rust SDK Tests (ubuntu-latest, default)	9m 29s
Rust SDK Bundled CLI Build (windows-latest)	4m 6s
Rust SDK Tests (macos-latest, inprocess)	14m 25s
Rust SDK Tests (windows-latest, default)	12m 55s
Rust SDK Bundled CLI Build (ubuntu-latest)	2m 59s
Rust SDK Tests (ubuntu-latest, inprocess)	13m 34s
	1h 8m 10s

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