Add basic authentication to the API

- Authentication should use an optional key provided as input to the CLI
- For start.sh it should use a randomly generated key unless HELIOS_LOCAL_API_KEY env var is set
- It should only validate be used in /v3 endpoints, /v1 and /v2 are authenticated by the supervisor

Here is a possible implementation https://www.ruststepbystep.com/simple-api-key-authentication-in-axum-step-by-step-guide/