feat: Cortex Backend Auth

[louis-jan]

Problem
We would support multiple users at the same time, and all data should be scoped by user. All of the requests would be gated by the AuthZ, and clients could perform AuthN for both use cases.

Local use case:

• A single user, created automatically (the root user). User don't have to sign in, it would be done automatically.

Remote use case:

• Multiple users require authentication.

Success Criteria
A clear and concise description of what you want to happen.

Additional context
Add any other context or screenshots about the feature request here.