Optional PII logging (#11322)

* Start with logger

* allow user to enable PII logging

* prefix the log

extensions/azurecore/src/utils/Logger.ts

@@ -0,0 +1,36 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+export class Logger {
+	private static _piiLogging: boolean = false;
+
+	static log(msg: any, ...vals: any[]) {
+		if (vals && vals.length > 0) {
+			return console.log(msg, vals);
+		}
+		console.log(msg);
+	}
+
+	static error(msg: any, ...vals: any[]) {
+		if (vals && vals.length > 0) {
+			return console.error(msg, vals);
+		}
+		console.error(msg);
+	}
+
+	static pii(msg: any, ...vals: any[]) {
+		if (this.piiLogging) {
+			Logger.log(msg, vals);
+		}
+	}
+
+	public static set piiLogging(val: boolean) {
+		this._piiLogging = val;
+	}
+
+	public static get piiLogging(): boolean {
+		return this._piiLogging;
+	}
+}