admin(ui): add missing API requests

resources/scripts/api/admin/roles/getRole.ts

@@ -0,0 +1,10 @@
+import http from '@/api/http';
+import { Role, rawDataToRole } from '@/api/admin/roles/getRoles';
+
+export default (id: number): Promise<Role> => {
+    return new Promise((resolve, reject) => {
+        http.get(`/api/application/roles/${id}`)
+            .then(({ data }) => resolve(rawDataToRole(data)))
+            .catch(reject);
+    });
+};