Feat: BullMQ job worker

Utilize BullMQ to execute jobs

See !86

TODO

• Remove all uses of setInterval & setTimeout (eslint rule added)
• Run all workers in main thread in development mode (env var)
• Run workers in separate threads in production mode (env var)
• convert packages/server/workers/ to bullmq workers not sure of a clean way to achieve this

Possible improvements

• Adding an admin UI for viewing queue states