Initial AD support for BDCs (#6741)

Partially working AD support for BDCs with some known issues
- Plumbed through kerberos support to Notebooks.
  - Using "gateway-0" for service temporarily as service endpoints API doesn't yet return correct DNS name. Will update in separate PR once available
- Plumbed kerberos auth to HDFS, Spark. Only partially working as we use same token on each call 
  - Will fix in separate PR, as this requires a refactor of WebHDFS library. Will need to either get new token every time or set a cookie, both of which require refactors
- Fixed error when Data Service node expansion failed and blocked all OE expansion
- Support for SqlToolsService change to use new cluster endpoints DMV
  -  Updated API to add new endpoints field to replace IP + port
  - Added logic to handle case where endpoints for Yarn, Grafana etc. are in the list
  - Sort list and use expected new localized strings

- Updated SqlToolsService to include support for new DMV
- Add "gateway-0" handling in Jupyter session as workaround for lack of domain names in endpoints list

extensions/mssql/src/objectExplorerNodeProvider/treeNodes.ts

@@ -78,8 +78,8 @@ export abstract class TreeNode implements ITreeNode {
 		return undefined;
 	}
 
-	public updateFileSource(connection: SqlClusterConnection): void {
-		this.fileSource = connection.createHdfsFileSource();
+	public async updateFileSource(connection: SqlClusterConnection): Promise<void> {
+		this.fileSource = await connection.createHdfsFileSource();
 	}
 	/**
 	 * The value to use for this node in the node path