Implementing Simple Timer (#19786)

* Implementing Simple Timer

* Bumping Task Version

* Updating Manual Test Flow

* Adding generated file

* Adding missing generated file

* Updating Simple Timer with Perfomance lib

* Updating package-lock.json

Author: adityashahms

Tasks/AzureTestPlanV0/SimpleTimer.ts

@@ -0,0 +1,32 @@
+import { ciDictionary } from "./ciEventLogger";
+import * as tl from 'azure-pipelines-task-lib/task';
+let perf = require('performance-now');
+
+export class SimpleTimer {
+    private startTime: number;
+    private endTime: number;
+    private featureName: string;
+
+    constructor(featureName: string) {
+        this.startTime = 0;
+        this.endTime = 0;
+        this.featureName = featureName;
+    }
+
+    start() {
+        this.startTime = perf();
+    }
+
+    stop(ciData:ciDictionary) {
+        this.endTime = perf();
+        tl.debug(`Execution Time for ${this.featureName} was ${this.getElapsedTime()} in milli-seconds`);
+        ciData[`Execution Time for ${this.featureName} in milli-seconds`] = this.getElapsedTime();
+    }
+
+    getElapsedTime(): number {
+        if (this.startTime === 0 || this.endTime === 0) {
+            throw new Error("Timer has not been started or stopped.");
+        }
+        return this.endTime - this.startTime;
+    }
+}