Configure project with support of composite builds

[Pschsch]

trafficstars

Seems like, we could just add check for gradle's parent like this:

//moko-resources/settings.gradle.kts
val isComposite = gradle.parent != null
if (isComposite) {
    includeBuild("resources-build-logic")
    includeBuild("resources-generator")
}

//moko-resources/resources-generator/settings.gradle.kts
val isComposite = gradle.parent != null
if (isComposite) {
    includeBuild("../resources-build-logic")   
}

To simplify contributing and testing