Add support Azure SPID based authentication for access to Azure Cosmos DB v2 via gateway connection

Hello,

We have a current progect that tracks access and logs to a Cosmos DB. The team would like to do a nightly pull to a dashboard and the current Power BI service gateway connection setup only supports authentication methods of Key and OAuth 2.0. This does not align with our security standards, or Microsoft's stated best practices, and we would like to see SPID/Workspace Identity available for use in authenicating the connection to Cosmos DB via a Power BI service gateway connection.