Add initial telemetry for schema compare (#5595)

* add initial telemetry to schema compare

* addressing comments

extensions/schema-compare/src/utils.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.
+ *--------------------------------------------------------------------------------------------*/
+'use strict';
+
+export interface IPackageInfo {
+	name: string;
+	version: string;
+	aiKey: string;
+}
+
+export function getPackageInfo(packageJson: any): IPackageInfo {
+	if (packageJson) {
+		return {
+			name: packageJson.name,
+			version: packageJson.version,
+			aiKey: packageJson.aiKey
+		};
+	}
+}
+
+/**
+ * Map an error message into a short name for the type of error.
+ * @param msg The error message to map
+ */
+export function getTelemetryErrorType(msg: string): string {
+	if (msg.indexOf('Object reference not set to an instance of an object') !== -1) {
+		return 'ObjectReferenceNotSet';
+	}
+	else {
+		return 'Other';
+	}
+}