saml20_idp: export/import Service Providers Whitelist (as e.g. csv )

[phavekes]

This issue is imported from pivotal - Originaly created at Jul 26, 2024 by andreklaver

Import, Export Service Providers Whitelist from an IdP as (e.g.) a CSV.

This will help when migrating/creating an IdP to whitelist previously connected services or other entities (default services) needed when creating an IdP.