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/package.json

@@ -25,6 +25,7 @@
     "figures": "^2.0.0",
     "find-remove": "1.2.1",
     "fs-extra": "^3.0.1",
+    "kerberos": "^1.1.2",
     "request": "^2.88.0",
     "request-promise": "^4.2.2",
     "service-downloader": "github:anthonydresser/service-downloader#0.1.6",
@@ -947,5 +948,8 @@
         }
       ]
     }
+  },
+  "devDependencies": {
+    "@types/kerberos": "^1.1.0"
   }
 }