Debug via run menu should allow connecting to existing running apps

[maxandersen]

trafficstars

when debugging a springboot or quarkus app or any other already running java app it would be nice that "Debug Java" could offer to scan for localhost running java processes to automatically connect to.

[testforstephen]

Currently, "Run Java" and "Debug Java" will launch a new Java application from the debugger. It may be more appropriate to add a new menu, such as "Attach Java", to scan for potential Java processes to connect to.