NsAuthProvider Implementation

[artntek]

Need to provide a non-hardcoded implementation for NsAuthProvider. It is currently hard-coded to authenticate and authorize without checking credentials.

It implements the AuthProvider interface. It should:

• Authenticates a user based on a jwt token
  • See the metacat and d1_portal implementation for details of how it's done, and cacheing to avoid a call to the CN with every request received.
• Verify that an authenticated user is Authorized to access given resources