[saml] Add support for configuring pkg pfSense-pkg-saml2-auth

[KevinB-rocks]

After adding SSO through SAML with pfrest/pfSense-pkg-saml2-auth I wanted to configure the settings of the package through Ansible and this package.

I've written a suggestion on implementation, and would like to hear your thoughts and comments. Thanks.

[KevinB-rocks]

Noticed the failing build pipeline, sorry for that. I've fixed the linting now.

[opoplawski]

Thanks for working on this. My first thought is that this doesn't belong in core, especially for a non-standard package. So I think a saml2_auth repository would be in order. Would you be interested in maintaining that?

I'll try to find some time to do a proper review at some point but my time is extremely oversubscribed these days. I'm also tweaking how some of the package handling functions work so there may be changes to be made there.

[KevinB-rocks]

I do understand your view that this could be suited for a separate repository. However, I don't have the time or resources to maintain such a repository now, but rather would like to share my work so others could use it, in the simplest way possible.

Could it be solved through clear distinctions in folder structure and documentation of this repo what is core and what is extended or non-standard functionality?

I'd imagine that we would have a stronger foundation if we pool the limited development resources into this project rather than split up in multiple repos that may go stale and end up in a mess if maintainers lose interest/don't have the time to begin with.