Stream Analytics Custom Policies

[marvinbuss]

Overview/Summary

Replace this with a brief description of what this Pull Request fixes, changes, etc.

This PR fixes/adds/changes/removes

1. Added Stream Analytics Custom Policies

As part of this Pull Request I have

• [x] Checked for duplicate Pull Requests
• [x] Associated it with relevant issues, for tracking and closure.
• [x] Ensured my code/branch is up-to-date with the latest changes in the main branch
• [x] Performed testing and provided evidence.
• [ ] Updated relevant and associated documentation.
• [ ] Updated the "What's New?" wiki page (located: /docs/wiki/whats-new.md)

[marvinbuss]

@jtracey93

Azure Stream Analytics

Policy Name	Policy Area	Description
Deny-StreamAnalytics-ClusterId	Network Isolation	Enforces use of Stream Analytics cluster.
Deny-StreamAnalytics-StreamingUnits	Budget	Enforces number of stream analytics streaming units.

[krowlandson]

• Closing as superseded by #1144