Add support for the --test option for package

[Gedochao]

Is your feature request related to a problem? Please describe.
To be consistent with other build methods, it should be possible to package the test scope along with main when using the package command.

Describe the solution you'd like
A --test command line option, similar to repl and compile.

Describe alternatives you've considered
Currently it's possible to compile the test scope separately and then add the output to the classpath for package.
It's a hassle though, and requires 2 separate scala-cli calls.

Additional context

• There is no command to run a main method in test scope #2728
• Enable including test scope inputs when publishing #3483
• Add repl command with test artifacts on path, corrensponding sbt command Test/console #2953