ML - dashboard icons and links (#10153)

* ML - dashboard icons and links

extensions/machine-learning/src/common/eventEmitter.ts

@@ -0,0 +1,45 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import * as vscode from 'vscode';
+
+export class EventEmitterCollection extends vscode.Disposable {
+	private _events: Map<string, vscode.EventEmitter<any>[]> = new Map<string, vscode.EventEmitter<any>[]>();
+
+	/**
+	 *
+	 */
+	constructor() {
+		super(() => this.dispose());
+
+	}
+
+	public on(evt: string, listener: (e: any) => any, thisArgs?: any) {
+		if (!this._events.has(evt)) {
+			this._events.set(evt, []);
+		}
+		let eventEmitter = new vscode.EventEmitter<any>();
+		eventEmitter.event(listener, thisArgs);
+		this._events.get(evt)?.push(eventEmitter);
+		return this;
+	}
+
+	public fire(evt: string, arg?: any) {
+		if (!this._events.has(evt)) {
+			this._events.set(evt, []);
+		}
+		this._events.get(evt)?.forEach(eventEmitter => {
+			eventEmitter.fire(arg);
+		});
+	}
+
+	public dispose(): any {
+		this._events.forEach(events => {
+			events.forEach(event => {
+				event.dispose();
+			});
+		});
+	}
+}