Support Azure Data Tables managed identity using new SDK

The new version of the [Azure Data Tables SDKs](https://devblogs.microsoft.com/azure-sdk/announcing-the-new-azure-data-tables-libraries/) supports Managed Identity.

I would like to be able to access Tables (Storage and Cosmos) using Identity, just like we can using the recent Functions support for Storage Blobs/Queues and Service Bus.

Thanks!

Start by reviewing the existing Functions support for managed identity with Storage Blobs/Queues and Service Bus, then read the linked announcement for the new Azure Data Tables SDKs. Done means Tables access for both Storage and Cosmos works through managed identity in the corresponding scenarios.

Written by the indexing model from the issue text.