Complete only imported classes on auto-typing and first completion and set up invocation count

idea/testData/completion/basic/common/ExtensionInsideFunction.kt

@@ -0,0 +1,22 @@
+class StrSome {
+  class StrOther
+
+  fun more() {
+    class StrInFun
+
+    fun Str<caret>
+  }
+}
+
+class StrMore {
+  class StrAbsent
+}
+
+// TIME: 1
+// EXIST: String~(jet)
+// EXIST: StrSome
+// EXIST: StrMore
+// EXIST: StrInFun
+// EXIST_JAVA_ONLY: StringBuilder
+// EXIST_JAVA_ONLY: StringBuffer
+// ABSENT: StrAbsent