feat(graphql): added simple graphql service with new backend plugin

plugins/graphql/src/index.ts

@@ -15,4 +15,5 @@
  */
 
 require('whatwg-fetch');
+
 export * from './service/router';

plugins/graphql/src/service/router.test.ts

@@ -34,9 +34,9 @@ describe('createRouter', () => {
     jest.resetAllMocks();
   });
 
-  describe('GET /ping', () => {
+  describe('GET /health', () => {
     it('returns ok', async () => {
-      const response = await request(app).get('/ping');
+      const response = await request(app).get('/health');
 
       expect(response.status).toEqual(200);
       expect(response.body).toEqual({ status: 'ok' });

plugins/graphql/src/setupTests.ts

@@ -14,3 +14,5 @@
  * limitations under the License.
  */
 require('whatwg-fetch');
+
+export {};