Add kotlinp, a tool to print Kotlin metadata in class/module files

At the moment, it's not published anywhere, but that may change soon

 #KT-23198

libraries/tools/kotlinp/testData/SimplePackage.kt

@@ -0,0 +1,8 @@
+internal inline fun <reified X : Any> topLevelFun(x: X) = X::class
+
+var topLevelProp: String? = null
+    private set
+
+typealias F<T, U> = Map<T, (StringBuilder) -> U?>
+
+typealias G<S> = F<List<S>, Set<S>>