KT-1051 Java interoperability completion - enum tests and test for auto import directive auto insert

idea/testData/completion/injava/handlers/ClassAutoImport.after.java

@@ -0,0 +1,7 @@
+import jettesting.ClassFromJet;
+
+public class Testing {
+    public static void test() {
+        ClassFromJet
+    }
+}

idea/testData/completion/injava/handlers/ClassAutoImport.java

@@ -0,0 +1,5 @@
+public class Testing {
+    public static void test() {
+        ClassFr<caret>
+    }
+}

idea/testData/completion/injava/handlers/ClassAutoImport.kt

@@ -0,0 +1,4 @@
+package jettesting
+
+class ClassFromJet {
+}