Add response time in api response to test latency (#3465)

* Add response time in api response to test latency

* linting fixes

Co-authored-by: Eric Reynolds <eric.reynolds@konghq.com>

packages/insomnia-app/app/common/send-request.ts

@@ -4,6 +4,10 @@ import { send } from '../network/network';
 import { getBodyBuffer } from '../models/response';
 import * as plugins from '../plugins';
 
+function toMs(num) {
+  return Math.round(num * 1000) / 1000;
+}
+
 export async function getSendRequestCallbackMemDb(environmentId, memDB) {
   // Initialize the DB in-memory and fill it with data if we're given one
   await db.init(
@@ -55,6 +59,7 @@ async function sendAndTransform(requestId, environmentId) {
       statusMessage: res.statusMessage,
       data: bodyBuffer ? bodyBuffer.toString('utf8') : undefined,
       headers: headersObj,
+      responseTime: toMs(res.elapsedTime),
     };
   } finally {
     plugins.clearIgnores();