Display a message when starting a daemon in debug mode

[zhaoyunxing92]

I don't know if the startup is successful after I turn it on, and the port is not released after I disconnect it.

Just like the following

➜  todo git:(main) ✗ mvnDebug clean compile
Preparing to execute Maven in debug mode
Listening for transport dt_socket at address: 8000

[gnodet]

I agree a hint would be welcomed. For the port, I also agree that given the port number is fixed, it would be preferable to release it. The problem is that debug mode is turned on at for the JVM and I don't think there's a way to enable/disable remote debugging dynamically, which would mean the daemon would have to be killed.

[zhaoyunxing92]

Well, then manually kill