Automatically detect a project in IDEA IntelliJ as Scala CLI when `project.scala` is present

[Gedochao]

Is your feature request related to a problem? Please describe. Extracted from #1489

Describe the solution you'd like If a project is imported from a directory containing the project.scala optional configuration file, IDEA IntelliJ should automatically detect it as Scala CLI (without the need to run scala-cli setup-ide . manually first)