Add the ability to debug a project when executed from another application

[tsukinoko-kun]

Example: Minecraft server plugin

The source code of the project contains the code for the plugin. Jack can build the jar file of that plugin.

For execution, an entry point is required. The plugin doesn't have an entry point.

Jack has to build the jar, move it into the server's plugin folder, start the server and attach the debugger.

Possible solution (concept)

This could be a parameter for the debug command to specify a different jar to run and an alternative location to move the compiled jar file.

jack debug --jar ./test-server/paper-server.jar --drop-in ./test-server/plugins