Quarkus: Add launch.json to templates and add APPSODY_DEBUG_PORT

[Kamran64]

Checklist:

• [x] Read the Code of Conduct and Contributing Guidelines.

• [x] Followed the commit message guidelines.

• [x] Stack adheres to Appsody stack structure.

Modifying an existing stack:

• [x] Updated the stack version in stack.yaml

Adds launch.json files to the templates since appsody debug seems to be supported (also removes issue in the README). Also adds the APPSODY_DEBUG_PORT environment variable to the Dockerfile-stack. This provides "documentation" over which port will be used for debugging and will be used by external projects such as Codewind who need this information specified.

[paulrobinson]

This looks good to me. I've tested the remote debug with IntelliJ and with live code reload and it seems to work fine.

I haven't yet tried it with VSCode, but can install it if you need another pair of eyes on it.

[skoh7645]

Thanks! No need to install VSCode, @Kamran64 and I have already checked it works :)