Add ability to set Configuration for licensee

[lhwdev]

I have one copy-pasted dependency which is not (should not) included in configuration, but I need it to included in information so that it is validated and included into artifacts.json.
I think it would be great if I:

• can add custom dependency, like

  licensee {
    addDependency("a:b:c")
  }

  (but this seems hard to implement and has poor extensibility)
• can set Configuration that is used to validate licenses.

  // do custom stuff with myConfiguration
  licensee {
    /* this. */ extraConfigurations += project.configurations["myConfiguration"] // or extraConfiguration = ...
  }

  This dummy configuration is only used for licensee, not used for dependencies or something.

[JakeWharton]

Hmm the proposed DSL doesn't really scale to the different usages of the plugin. In projects with Android, Kotlin multiplatform, or the combination of both there is a matrix of configurations which are used and sourced from the plugins themselves.

I'll have to think about this case.

[lhwdev]

I see. So, how about combining the extra configurations, like

• common configuration
• Android specific one
• KMP one

So if you use KMP + Android, you get all three configurations above combine.
Eventually just adding two List<Configuration>.
I think replacing original configuration is not needed(we have ignoreDependency), so we only need to do this for extra configurations.

[hfhbd]

This is now possible by creating your own licensee tasks by using the configrationToCheck function, see #191.