Checked that auto-import works for extension properties

idea/testData/quickfix/autoImports/extensionPropertyImport.after.kt

@@ -0,0 +1,9 @@
+// "Import" "true"
+// ERROR: Unresolved reference: someVal
+package test
+
+import test.data.someVal
+
+fun some() {
+    "".someVal
+}

idea/testData/quickfix/autoImports/extensionPropertyImport.before.Main.kt

@@ -0,0 +1,7 @@
+// "Import" "true"
+// ERROR: Unresolved reference: someVal
+package test
+
+fun some() {
+    "".<caret>someVal
+}

idea/testData/quickfix/autoImports/extensionPropertyImport.before.data.Sample.kt

@@ -0,0 +1,3 @@
+package test.data
+
+val String.someVal: Int get() = 1