BE: Associate privileges with a user during authentication

[mfbrown]

As a user, when I log in to Fides via the UI, I am assigned the role or privileges which have been designated, so that I have the appropriate permissions to carry out tasks scoped to my role.

Details When implementing this - we should plan for a future where roles, permissions, etc are determined or influenced by an identity provider like Okta, Auth0, LDAP, Active Directory, etc.

AC

• Given that I am a user of Fides, when I access the platform, then my user is granted the appropriate OAuth scopes based on the role and privilege assignments granted to my username.

[tariqajyusuf]

Chiming in on this, we're also interested in this for our own implementation of Fides. Right now it seems like it's possible to, at a basic level, authenticate with SWA and Okta but optimally something like an OIDC flow would make this provisioning easier (CC: @NevilleS who I was talking with in Slack about this)