CosmosDB sample updates

### Issue Details
The various SQL issues at https://github.com/Azure/azure-quickstart-templates/tree/master/quickstarts/microsoft.documentdb all are using an older API version that spins up SQL instances using 'Microsoft.DocumentDB/databaseAccounts/apis/databases/containers@2016-03-31' However, these older APIs don't include most modern features (Severless, composite indices, etc.)

The [documentation](https://docs.microsoft.com/en-us/azure/cosmos-db/sql/quick-create-template?tabs=CLI) for Cosmos and an ARM template reflects the latest APIs, but it's not clear how the resource.id, naming convention has changed between them, so it'd be great to see up to date samples on how this has changed.

Start with the SQL quickstarts under quickstarts/microsoft.documentdb and compare their @2016-03-31 resources with the linked Cosmos DB ARM template and documentation. Update the samples to current API and resource naming, then verify that the resulting templates demonstrate the requested modern features.

Written by the indexing model from the issue text.