feat(plugins/gcpaudit): introduce optional UseAsync field in gcpaudit plugin #501

Job	Run time
get-changed-plugins / get-values	5s
build-plugins / build-packages-x86_64	6m 49s
build-plugins / build-packages-aarch64	6m 38s
build-rules-tool / build-rules-checker	26s
validate-plugins	1s
suggest-rules-version	1s
	14m 0s

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