Kusto extension for ADS (#11752)

* Kusto extension

* Add kusto to extensions.ts

* Remove objectExplorerNodeProvider

* Removed some BDC items + CR cleanup

* Cleanup unused strings in package.nls.json

* Remove unused svgs, and some cleanup

* Bringing objectExplorerNode back and hygiene changes

* rename to KustoObjectExplorerNodeProvider

* rename to KustoIconProvider

* Cleanup SQL code

* Fix compilation error

* Clean up in objectExplorerNodeProvider folder

* Some more clean up based on comments

* apiWrapper add

* changed to camelCase

* Remove unused functions/files

* Removed AgentServicesFeature

* dacfx, cms, schemacompare clean up

* Clean up and addressed few comments

* Remove apWrapper from kusto extension

* Addressed few comments

* credentialstore and escapeexception changes

* Added strict check for Kusto extension

* Fix error and addressed comment

* Saving Kusto files shoulf default to .kql

* package.json changes

* Fix objectExplorerNodeProvider

* Amir/kusto fix (#11972)

* Add the compiled extensions.js

* Fix strict compile rules

Co-authored-by: Monica Gupta <mogupt@microsoft.com>
Co-authored-by: Amir Omidi <amomidi@microsoft.com>

extensions/kusto/src/objectExplorerNodeProvider/providerBase.ts

@@ -0,0 +1,13 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+'use strict';
+
+import * as constants from '../constants';
+
+export abstract class ProviderBase {
+	public readonly providerId: string = constants.kustoClusterProviderName;
+	public handle?: number;
+}