Completion and import popup for bound callable references

idea/idea-completion/testData/basic/common/callableReference/SyntheticExtensions2.kt

@@ -0,0 +1,10 @@
+import java.io.File
+
+fun f(file: File) {
+    val v = file::<caret>
+}
+
+// EXIST_JAVA_ONLY: { itemText: "getFreeSpace", tailText: "()", attributes: "bold" }
+// ABSENT: freeSpace
+// EXIST_JAVA_ONLY: { itemText: "isFile", tailText: "()", attributes: "bold" }
+// ABSENT: { itemText: "isFile", tailText: " (from isFile())" }