Add support for installing azdata on Windows (#11387)

* Add support for installing azdata on Windows

* Don't run startup code when in test context since it blocks on UI input

* restart checks

* Disable calls for now

extensions/azdata/src/common/childProcess.ts

@@ -0,0 +1,34 @@
+/*---------------------------------------------------------------------------------------------
+ *  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';
+import * as cp from 'child_process';
+import * as loc from '../localizedConstants';
+
+/**
+ * Wrapper error for when an unexpected exit code was recieved
+ */
+export class ExitCodeError extends Error {
+	constructor(public code: number) {
+		super(`Unexpected exit code ${code}`);
+	}
+}
+
+/**
+ *
+ * @param command The command to execute
+ * @param args Optional args to pass, every arg and arg value must be a separate item in the array
+ * @param outputChannel Channel used to display diagnostic information
+ */
+export async function executeCommand(command: string, args?: string[], outputChannel?: vscode.OutputChannel): Promise<string> {
+	return new Promise((resolve, reject) => {
+		outputChannel?.appendLine(loc.executingCommand(command, args ?? []));
+		const buffers: Buffer[] = [];
+		const child = cp.spawn(command, args);
+		child.stdout.on('data', (b: Buffer) => buffers.push(b));
+		child.on('error', reject);
+		child.on('exit', code => code ? reject(new ExitCodeError(code)) : resolve(Buffer.concat(buffers).toString('utf8').trim()));
+	});
+}