Completion and import popup for bound callable references

idea/idea-completion/testData/basic/multifile/CallableReferenceNotImportedExtension2/CallableReferenceNotImportedExtension2.dependency.kt

@@ -0,0 +1,7 @@
+package dependency
+
+fun CharSequence.extFun(){}
+
+val String.extVal: Int get() = 1
+
+fun Int.wrongExtFun(){}

idea/idea-completion/testData/basic/multifile/CallableReferenceNotImportedExtension2/CallableReferenceNotImportedExtension2.kt

@@ -0,0 +1,5 @@
+val v = "a"::<caret>
+
+// EXIST: extFun
+// EXIST: extVal
+// ABSENT: wrongExtFun