Add support for AzureRoleEligibilityScheduleSettings

[mpoulson]

Pull Request (PR) description

Initial release to add AzureRoleEligibilityScheduleSettings to align with AADRoleSetting. Allow setting the Azure Role PIM Assignment and Eligibility settings for each role at the various scopes.

This Pull Request (PR) fixes the following issues

• Fixes AzureRoleEligibilityScheduleSettings: New Resource Proposal #6974

Task list

• Added an entry to the change log under the Unreleased section of the file CHANGELOG.md.
  Entry should say what was changed and how that affects users (if applicable), and
  reference the issue being resolved (if applicable).
• Resource parameter descriptions added/updated in the schema.mof.
• Resource documentation added/updated in README.md.
• Resource settings.json file contains all required permissions.
• Examples appropriately added/updated.
• Unit tests added/updated.
• New/changed code adheres to DSC Community Style Guidelines.

[FabienTschanz]

The Ensure parameter is missing. Either it is added or if the resource only exists once in this combination, then IsSingleInstance must be added. At least one of those two properties must be present.

[mpoulson]

Should be ready to go