[CosmosDB]Updating with recent features: Autoscale, EnableFreeTier, ServerVersion, EnableAnalyticalStorage (#12066)

* Updating sdk and relevant changes with the updation

* Added Autoscale related changes and EnableFreeTrie, ServerVersion and EnableAnalyticalStorage in Account creation and updation

* modifying tests and refactoring update throughput cmdlets

* Updated API tests

* Refactoring Account cmdlets and tests

* added changelog

* updated account tests using objects

* Updated tests

* updated PrivateEndpoint tests

* re-ran tests for add-region

Co-authored-by: Meha Kaushik <mekaushi@microsoft.com>