[FEATURE] Add multi tenancy feature flag and whether user is security admin info at request level in authHandler

[raintygao]

Is your feature request related to a problem?
My team is working on building a new plugin in OSD. We depend on the info in our new plugin that whether multi tenancy feature is on and whether user is security admin and we didn't find any existing ways to get this info. As an OSD plugin, we can't directly depend on the security plugin, so we want to add this information to authHandler.

What solution would you like?
We want to add two attributes in auth object so that our plugin can get info from http auth.

Do you have any additional context?
I can submit a pull request to implement this feature.