Reimplement kscript in kotlin #36

2 Problems would need to be solved

1. How to overcome JVM startup delay? Either by using kotlin-native or by using a virtualizaiton model such as avian (see https://github.com/ReadyTalk/avian and https://blog.plan99.net/kotlin-native-310ffac94af2)
2. How to mimic process substitution? Currently by using exec we replace the kscript process with the actual jvm process at the end is really nice. Not sure how to do this from within the JVM.

Alternatively we could also reimplement in Go-lang

By rewriting it in Kotlin we pay with 120ms per launch but we gain a lot of stability, cleaner code and portablity.