Provide support for Kotlin KClass parameter in SpringApplication.run() #8511
Description
It would be nice to support natively Kotlin KClass parameter to allow writing SpringApplication.run(FooApplication::class, *args) in Spring Boot 2.0.
I could be implemented using classpath detection, would avoid java.lang.IllegalArgumentException: Invalid source type class kotlin.reflect.jvm.internal.KClassImpl error that Kotlin users get by default and would provide more idomatic Kotlin code than the current SpringApplication.run(FooApplication::class.java, *args).