DHE: Worker Lifecycle Management

[bmingles]

The vscode extension needs to be able to manage core+ workers supported by a DHE server.

Initial Pass

• List workers created by the extension
• Ability to create new console worker, connect to it, stop it
• Initial "experimental" configuration from settings.json

UI

• DH-17600 - UI for creating new workers should be encapsulated in DHE and then exposed via an iframe to the extension. TBD on how stopping workers should be implemented. We should be using temporary PQs of type interactive console instead of WebClientData apis.
• Integrate the UI / iframe with the extension

A few code references for PQs

• ConsoleSetupQuery.java#L38
• DraftManager.ts#L45
• Login.tsx#L575