Add code to use SQL server as the feature registry on Azure

### Willingness to contribute

Yes. I would be willing to contribute to this for with guidance from the Feathr community.

### URL(s) with the issue

_No response_

### Description of proposal (what needs changing)

The current documentation has details on how to use Azure Purview as a feature registry but lacks any code or documentation around using SQL server for same. It would be great if some code/guidance could be added on how to configure the registry for SQL server.