Supporting materialized views in Kusto extension

[ludwhe]

Is your feature request related to a problem? Please describe.
When querying an Azure Data Explorer connection, materialized views are not supported for autocompletion. When browsing it, materialized views are not shown.

Describe the solution or feature you'd like
It would be nifty to have autocompletion for queries over materialized views, and to be able to list them from the Servers view.

Describe alternatives you've considered
Using queries like .show materialized-views helps find them, but autocompletion on queries is not emulatable.

Additional context
The expected behavior can be achieved in dataexplorer.azure.com.

[ludwhe]

Created a PR for this : microsoft/sqltoolsservice#2028 😄

[FakieHeelflip]

What about this Feature? Need this as well.