Merge with WebAssembly/spec branch `wasm-3.0` #13

Job	Run time
build-legacy-exceptions-core-spec	1m 3s
build-core-spec	7m 16s
build-js-api-spec	32s
build-legacy-exceptions-js-api-spec	41s
build-web-api-spec	26s
build-spec-versions	3s
build-code-metadata-spec	2m 26s
publish-spec	7s
	12m 34s

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