Add BDC spark connection logging (#17277)

* Add BDC spark connection logging

* fix test failures

extensions/notebook/src/common/logger.ts

@@ -0,0 +1,28 @@
+/*---------------------------------------------------------------------------------------------
+ *  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';
+
+class LoggerImpl {
+	private _output: vscode.OutputChannel | undefined;
+
+	constructor() {
+	}
+
+	initialize(channel: vscode.OutputChannel) {
+		this._output = channel;
+	}
+
+	log(msg: string): void {
+		this._output?.appendLine(`[${new Date().toISOString()}] ${msg}`);
+	}
+
+	show(): void {
+		this._output?.show(true);
+	}
+}
+
+const Logger = new LoggerImpl();
+export default Logger;