[Feature Request] Set authentication to output (Azure Blob) using Azure CLI StreamAnalytics Extension and Managed ID

- If the issue is to do with Azure CLI 2.0 in-particular, create an issue here at [Azure/azure-cli](https://github.com/Azure/azure-cli/issues)

### Extension name (the extension in question)
stream-analytics

### Description of issue (in as much detail as possible)
Hi,

I plan to use the Azure CLI StreamAnalytics extension to Blob storage ad Stream Analytics jobs output distination.
I want to use a Managed ID for authentication, but as far as I can see the help, can't find that setting.
Also, I checked the following documents, but only the method using the portal and ARM template was described.
I would like to request that it can be achieved only with the Azure CLI Stream Analytics extension.

- Authenticate blob output with Managed Identity Azure Stream Analytics | Microsoft Docs
https://docs.microsoft.com/en-us/azure/stream-analytics/blob-output-managed-identity

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