Spring Boot DevTools support

[Spring Boot DevTools](https://docs.spring.io/spring-boot/docs/current/reference/html/using-boot-devtools.html) came up a couple of times as a feature to support for Skaffold's filesync. This requires some more advanced workflows because of syncing compiled files to the container that we could invest into if there is enough demand.

I'm opening this issue to see if there is any interest in this from the user community. If you are a user of both Spring Boot Developer Tools and Skaffold, let us know if you are interested in this feature by commenting or putting a thumbs up on this issue!