Provide support of Scala 3

[prabutdr]

Please provide support of submitting solutions in scala 3

[hobovsky]

Languages, packages, and updates of those should be requested on the issue board of the codewars/runner repository.

Scala 3 is already supported by Codewars: https://docs.codewars.com/languages/scala but there is a list of kata which does not work with Scala 3 and has to be updated by users. You are welcome to help :)