[Dashboard] Publish NPM library

[thatcort]

Description

It would be great to have a Typescript/Javascript NPM library so that other TS/JS applications can monitor and interact with a Ray cluster as done in the dashboard. This will enable embedding into other applications without needing to expose the full Dashboard UI.

Use case

Embed Dashboard functionality in an application without exposing the full Dashboard UI. For example, this could expose information and controls for specific jobs or actors, while hiding the full complexity of the cluster state.