enhancement: Expiring secrets and certs

[tlourey]

Id like to suggest some additional cmdlets that list/export the expiring secrets and certificates for a Tenant.

Similar to the expiring examples on https://learn.microsoft.com/en-au/entra/identity/enterprise-apps/app-management-powershell-samples but perhaps a little simpler.

One cmdlet that exports both certs and secrets for both app registrations and enterprise apps. Perhaps even the one that exports beyond the required date. The cmdlet would allow filtering and a date range. Something that is easy to schedule as well.