upkeep: add TS support for useTaxonomy hook

hooks/use-taxonomy/index.ts

@@ -0,0 +1,17 @@
+import { useSelect } from '@wordpress/data';
+import { store as coreStore } from '@wordpress/core-data';
+import type { Taxonomy } from '@wordpress/core-data';
+
+export function useTaxonomy(taxonomyName: string) {
+	return useSelect(
+		(select) => {
+			const { getTaxonomy, hasFinishedResolution } = select(coreStore);
+
+			const hasResolvedTaxonomy = hasFinishedResolution('getTaxonomy', [taxonomyName]);
+			const taxonomy = getTaxonomy(taxonomyName);
+
+			return [taxonomy, hasResolvedTaxonomy];
+		},
+		[taxonomyName],
+	) as [ Taxonomy, boolean ];
+}