Fixed KT-5046 No autocompletion for not imported extension properties

#KT-5046 Fixed

idea/testData/completion/basic/custom/TopLevelNonImportedExtProp.kt

@@ -0,0 +1,8 @@
+package testing
+
+fun someFun() {
+  "".hello<caret>
+}
+
+// EXIST: helloProp1, helloProp2
+// ABSENT: helloProp3, helloProp4

idea/testData/completion/basic/custom/TopLevelNonImportedExtPropSrc/source.kt

@@ -0,0 +1,6 @@
+package abc
+
+public val String.helloProp1: Int get() = 1
+public val String.helloProp2: Int get() = 2
+public val Int.helloProp3: Int get() = 3
+public val helloProp4: Int = 4

idea/testData/completion/basic/multifile/NotImportedExtensionProperty/NotImportedExtensionProperty.dependency.kt

@@ -0,0 +1,6 @@
+package abc
+
+val String.helloProp1: Int get() = 1
+val String.helloProp2: Int get() = 2
+val Int.helloProp3: Int get() = 3
+val helloProp4: Int = 4

idea/testData/completion/basic/multifile/NotImportedExtensionProperty/NotImportedExtensionProperty.kt

@@ -0,0 +1,12 @@
+package first
+
+fun firstFun() {
+    val a = ""
+    a.hello<caret>
+}
+
+// EXIST: helloProp1
+// EXIST: helloProp2
+// ABSENT: helloProp3
+// ABSENT: helloProp4
+// NUMBER: 2