Kapt: Add runtime library, move all modules inside the 'kapt3' directory

plugins/kapt3/kapt3-compiler/testData/converter/enums.kt

@@ -0,0 +1,13 @@
+enum class Enum1 {
+    BLACK, WHITE
+}
+
+annotation class Anno1(val value: String)
+
+enum class Enum2(@Anno1("first") val col: String, @Anno1("second") val col2: Int) {
+    RED("red", 1), WHITE("white", 2);
+    fun color() = col
+
+    private fun privateEnumFun() {}
+    public fun publicEnumFun() {}
+}