Add panorama_auth_key to panos_mgtconfig

[rodvand]

Is your feature request related to a problem?

Starting in PAN-OS 10.1 the requirement for 10.1 firewalls connecting to Panorama is to use an Auth key.

https://docs.paloaltonetworks.com/pan-os/10-1/pan-os-new-features/panorama-features/authentication-key-for-secure-firewall-onboarding.html

Describe the solution you'd like

Add a panorama_auth_key to the module panos_mgtconfig.

Describe alternatives you've considered

Using a raw API call, but then using Ansible kinda loses its point.