Set up hot reloading with JRebel

[knjk04]

Is your feature request related to a problem? If so, please describe.
It can be slow to restart the server every time we make a change.

Describe the solution you'd like
Configure JRebel to work both when running the backend in Docker and without.

See https://netflix.github.io/dgs/advanced/schema-reloading/ for more information

Additional context

• Be sure to read the contributing guidelines first!
• Discuss your implementation approach with us before we assign you to it
• Provide us with an estimate on how long you think it will take you to complete
• Branch from main and set main as the destination branch in your pull request

If you need help with anything, we'll be happy to help you over a GitHub Q&A discussion or our Slack workspace