Stream Processing with Azure Stream Analytics Reference Architecture

Create a Terraform module that deploys a Stream processing reference architecture using Azure Stream Analytics and Cosmos Db.

Documentation about this architecture is available [here](https://docs.microsoft.com/en-us/azure/architecture/reference-architectures/data/stream-processing-stream-analytics).

The issue names no target files, tests, or entry points. Start by reading the linked Azure Stream Analytics reference architecture and inspecting the repository layout for existing Terraform modules. Done means a Terraform module deploys the described Stream Analytics and Cosmos DB stream-processing architecture.

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