Add saml integration

[marlokessler]

Add SAML integration with the passport-saml library.

[CLAassistant]

All committers have signed the CLA.

[dazraf]

Hello! Will this branch be resolved soon please? SAML integration is a big one for us!

[csuermann]

Hi @marlokessler, I hope this finds you well!

I want to inform you that we have released SAML support as an enterprise feature and are therefore closing this PR. In any case, a big thank you for your contribution, which our team took some inspiration from. As discussed when we last talked, I'll email you a personalized life-time license that includes access to the SAML feature.

Thanks again!
Cornelius

[marlokessler]

Hi @csuermann,

awesome to hear, that the feature is now fully integrated! Thank you a lot, it was a pleasure and a lot of fun to contribute! Also, a big thank you for the life-time license, I'm curious to try it out and use it 😃

Best regards
Marlo