Workaround NonClasspathClassFinder not supporting inner classes

Explicitly split qualified names, can be removed once platform is fixed

 #KT-19310 Fixed

idea/testData/script/definition/highlighting/javaNestedClass/script.kts

@@ -0,0 +1,9 @@
+import lib.*
+
+fun f(
+    <warning>g</warning>: JavaInterface.G,
+    <warning>f</warning>: JavaInterface.F,
+    <warning>i</warning>: JavaInterface.F.I
+) {
+
+}