Allow to generate the common directory layout

Hi there,

Is there a way we can generate the common directory layout? (eg: ```src/main/kotlin```, ```src/main/resources```, ```src/test/kotlin```, ```src/test/resources```)

Maybe using checkbox? ```[x] Use standard/maven directory layout```

Thanks!!

Start by inspecting the project-generation flows for the web page and IDEA plugin, since the issue does not name specific files or tests. Determine where a standard/Maven directory-layout option could be exposed, then verify that generated projects include src/main/kotlin, src/main/resources, src/test/kotlin, and src/test/resources.

Written by the indexing model from the issue text.