Add a flag for printing all available test frameworks in the project

[Gedochao]

Is your feature request related to a problem? Please describe. I'd like to make it possible to print all available test frameworks in a Scala CLI project, so I can later pre-configure them with --test-framework///> using testFramework.

Describe the solution you'd like A --print-test-frameworks flag should do, similar to --print-classpath. A warning may be necessary when running on Scala.js/Scala Native, as this may take a bit, especially for larger projects.

Describe alternatives you've considered One can always run scala-cli test with increased verbosity, I suppose.

Additional context

• https://github.com/VirtusLab/scala-cli/pull/3621