Replace azure-cosmos by azure-mgmt-cosmosdb

**Description**

This should be a change which not effects the usage of the related provider modules i.e. **refactoring**.

Microsoft actively develops python packages for Azure in https://github.com/Azure/azure-sdk-for-python
> This repository is for active development of the Azure SDK for Python

Those packages can be recognized by prefix `azure-mgmt-`.

The issue names no files, tests, or entry points. Start by searching the repository for azure-cosmos and the related provider modules, then verify the dependency can be replaced with azure-mgmt-cosmosdb without changing provider usage; done means all relevant references and dependency declarations use the replacement.

Written by the indexing model from the issue text.