Add operator request timeout

[deliahu]

Description

The operator should timeout if a request is taking too long

Notes

• Probably want to use context.Context: create new Context for every request, and that context gets sent down to all downstream async requests (e.g. uploading to S3) to determine timeout
• errgroup supports context.Context

Resources

• https://ieftimov.com/post/make-resilient-golang-net-http-servers-using-timeouts-deadlines-context-cancellation/
  https://blog.golang.org/context