OpenID Connect support

[fhennig]

https://airflow.apache.org/docs/apache-airflow/stable/security/webserver.html#web-authentication

https://flask-appbuilder.readthedocs.io/en/latest/security.html

Issue checklist

This is a simple checklist of things to bear in mind when creating a new issue.

• Describe the use-case, as far is possible. For instance, using the pattern "As a XXXX, I would like XXXX to be able to do XXXX" helps to identify the feature as well as the problem it is intended to address.
• Indicate an approximate level of importance and urgency.
• Indicate if there is a known work-around until such time as the issue has been implemented.

[Maleware]

We could argue this is done with a 60% solution already with #493 being merged.

We could similar to superset add the necessary libraries to our dockerfile. However those could be installed via the mechanism mentioned above too.

[Maleware]

stackabletech/docker-images#891 will make it a 80 percent solution