Add API endpoint to get user's webhooks

Closes #11290

website/server/controllers/api-v3/webhook.js

@@ -95,6 +95,24 @@ api.addWebhook = {
   },
 };
 
+/**
+ * @api {get} /api/v3/user/webhook Get webhooks - BETA
+ * @apiName UserGetWebhook
+ * @apiGroup Webhook
+ *
+ * @apiSuccess {Array} data User's webhooks
+ */
+api.getWebhook = {
+  method: 'GET',
+  middlewares: [authWithHeaders()],
+  url: '/user/webhook',
+  async handler (req, res) {
+    let user = res.locals.user;
+
+    res.respond(200, user.webhooks);
+  },
+};
+
 /**
  * @api {put} /api/v3/user/webhook/:id Edit a webhook - BETA
  * @apiName UserUpdateWebhook