[Feature] Create/use service accounts for machine identity management

[j7lloyd]

Describe the feature request

Summary:
A service account is a container for stored credentials, configured to perform machine identity-related operations without requiring user interaction. Key benefits and specific use cases include:

• Active Directory management: Create or delete computer accounts without repeatedly entering domain credentials.
• Managing stale Azure AD or Intune devices: Streamline the removal of orphaned objects without manual intervention.

Is this an enhancement to an existing resource or data source, if so which one?
This change will enhance the existing citrix_machine_catalog resource and add a new resource, i.e. citrix_service_account.

Link to any docs that cover this feature:
https://docs.citrix.com/en-us/citrix-daas/install-configure/service-accounts.html

Link to any APIs that cover this feature:
https://developer-docs.citrix.com/en-us/citrix-daas-service-apis/citrix-daas-rest-apis/apis/#/Identity-APIs

CitrixIssueId: 59127