feat(editor): Add routing middleware, permission checks, RBAC store, RBAC component (#7702)

Github issue / Community forum post (link here to close automatically):

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Co-authored-by: Csaba Tuncsik <csaba@n8n.io>

packages/editor-ui/src/rbac/middleware/guest.ts

@@ -0,0 +1,16 @@
+import type { RouterMiddleware } from '@/types/router';
+import { VIEWS } from '@/constants';
+import type { GuestPermissionOptions } from '@/types/rbac';
+import { isGuest } from '@/rbac/checks';
+
+export const guestMiddleware: RouterMiddleware<GuestPermissionOptions> = async (to, from, next) => {
+	const valid = isGuest();
+	if (!valid) {
+		const redirect = to.query.redirect as string;
+		if (redirect && redirect.startsWith('/')) {
+			return next(redirect);
+		}
+
+		return next({ name: VIEWS.HOMEPAGE });
+	}
+};