Kapt: add some JeElement tests

(cherry picked from commit 948a4b6)

plugins/annotation-processing/testData/kotlinWrappers/simple.kt

@@ -0,0 +1,10 @@
+// test.Simple
+
+package test
+
+abstract class Simple(private val prop: String) {
+    protected val anotherProp: Int = 5
+    
+    abstract fun strFun(val x: Long): String
+    fun voidFun() {}
+}