Implement `CheckMetadataHash` extension #445

Job	Run time
check-dependency-rules	10s
check-workspace	17s
set-image	10s
check-markdown	14s
fmt	1m 15s
check-rust-feature-propagation	2m 13s
check-toml-format	1m 24s
test-rust-features	2m 3s
	7m 46s

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