KT-5959 Imports should be inserted on paste from java with conversion to Kotlin

#KT-5959 Fixed

idea/testData/copyPaste/conversion/AddImports.java

@@ -0,0 +1,9 @@
+import java.io.File;
+import java.util.Collections;
+import java.util.List;
+
+class C {
+<selection>    List<String> foo(File file) {
+        return Collections.emptyList();
+    }
+</selection>}