Expose Patterns Modal to core/interface store like the Preferences modal

[jhned]

What problem does this address?

The only way to open the Patterns modal is to click on the Block Inserter, go to the Patterns tab, and then click "Explore All Patterns." This makes it more difficult for users to discover patterns. The Patterns modal visibility is controlled via useState in the BlockPatternsTabs component.

gutenberg/packages/block-editor/src/components/inserter/block-patterns-tab.js

Lines 255 to 263 in bcaac56

	<Button
	className="block-editor-inserter__patterns-explore-button"
	onClick={ () =>
	setShowPatternsExplorer( true )
	}
	variant="secondary"
	>
	{ __( 'Explore all patterns' ) }
	</Button>

What is your proposed solution?

If the Patterns modal were accessible via the core/interface data store like the Preferences modal, then the Patterns modal could be opened via other methods.

gutenberg/packages/edit-site/src/components/preferences-modal/index.js

Lines 21 to 29 in bcaac56

	export const PREFERENCES_MODAL_NAME = 'edit-site/preferences';
	export default function EditSitePreferencesModal() {
	const isModalActive = useSelect( ( select ) =>
	select( interfaceStore ).isModalActive( PREFERENCES_MODAL_NAME )
	);
	const { closeModal, openModal } = useDispatch( interfaceStore );
	const toggleModal = () =>
	isModalActive ? closeModal() : openModal( PREFERENCES_MODAL_NAME );

We could then use wp.data.dispatch('core/interface').openModal(PATTERNS_MODAL_NAME) to open the modal.