Enhancement: Cosmos DB Databases and Containers by adding Throughput

[ElvenSpellmaker]

Now hashicorp/terraform-provider-azurerm#5203 has been merged, after a release we should add throughput to CosmosDB Databases instead of collections. The PR supports container and DB provisioned throughput

Question for thought: If 400 is the minimum and each container needs 100 RU minimum then terraform could try to resize to an invalid value. 🤔
Maybe we should enforce an approach of always using Terraform to create new Containers and Databases.

[guibirow]

We also have some scripts in the pipeline (resources) to create the collections, these should be created by TF for better consistency

[estherthetesteramido]

@dnitsch what additional enhancements may we want to add to this?