Issue describing the changes in this PR

Add support for new PorwerShell programming model

Changes in this PR:

• Add support for worker indexing
• Update unit tests
• Add AzureFunctions.PowerShell.SDK to requirements.psd1 -- this module contains the Get-FunctionsMetadata

Pull request checklist

• My changes do not require documentation changes
  • Otherwise: Documentation issue linked to PR
• My changes should not be added to the release notes for the next release
  • Otherwise: I've added my notes to release_notes.md
• My changes do not need to be backported to a previous version
  • Otherwise: Backport tracked by issue/PR #issue_or_pr
• I have added all required tests (Unit tests, E2E tests)

Additional information

Additional PR information