Run-as-local-process and hot-reload development server

[andrewazores]

Currently the intended development cycle for the Cryostat backend is to make edits to the sources, then run mvn verify to build the OCI image and run all relevant tests, then sh smoketest.sh to run that OCI image as a Podman container to test it manually with curl etc. This is a pretty long and slow process end-to-end. It can be sped up somewhat by doing mvn -DskipTests=true -Dcryostat.minimal=true package instead, to skip unit and integration tests and to not (re)build the web-client, but this is still fairly slow. It would be nice to have a devserver setup similar to what the web-client has, where changes cause automatic recompilation and redeploy, while the Cryostat backend webserver is running as a local JVM process on the development machine. There would be no sample apps available as in the smoketest.sh, and no ability to apply container resource limits, so it would not be a replacement for the existing development cycle. Rather it would be a nice-to-have when adding a new API handler or fixing a bug with an existing handler, for example, since changes could be much more rapidly made and verified using curl/httpie/wget.