Add opaque `metadata` passthrough to SDK tool definitions #1756

Job	Run time
Rust SDK Tests (ubuntu-latest, inprocess)	14m 16s
Rust SDK Tests (macos-latest, default)	7m 58s
Rust SDK Tests (ubuntu-latest, default)	9m 41s
Rust SDK Tests (windows-latest, default)	13m 31s
Rust SDK Tests (macos-latest, inprocess)	12m 4s
Rust SDK Bundled CLI Build (windows-latest)	4m 24s
Rust SDK Bundled CLI Build (ubuntu-latest)	2m 56s
Rust SDK Bundled CLI Build (macos-latest)	3m 42s
	1h 8m 32s

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