create toggleEmailNotifications util method

src/utils/users/toggleEmailNotifications.ts

@@ -0,0 +1,13 @@
+import fetchWrapper from "../fetchWrapper";
+import getXSRFToken from "../getXSRF";
+
+export default async function toggleEmailNotifications(id: number) {
+    const csrfToken = await getXSRFToken();
+
+    return fetchWrapper(
+        `/api/users/${id}/email-notifications`,
+        {},
+        "PATCH",
+        { "X-XSRF-TOKEN": csrfToken }
+    );
+}