Record special descriptor in REFERENCE_TARGET for type alias object

If a type alias is used to reference an object (companion object) as a
qualifier, record FakeCallableDescriptorForTypeAliasObject in
REFERENCE_TARGET. This tells IDE that type alias was used in the file,
thus, if it's imported, such import isn't redundant.
REFERENCE_TARGET is used mostly by IDE and by ClassifierUsageChecker,
which we also have to update to handle qualifiers with
FakeCallableDescriptorForTypeAliasObject in REFERENCE_TARGET.

Rewrite some parts of ClassifierUsageChecker for cleaner interaction.

 #KT-21863 Fixed Target versions 1.2.40

idea/testData/inspections/unusedImport/noUnusedImportForTypeAliasUsedAsObject.Dependency.kt

@@ -0,0 +1,10 @@
+package something
+
+object N
+
+class WC {
+    companion object
+}
+
+typealias T = N
+typealias TWC = WC

idea/testData/inspections/unusedImport/noUnusedImportForTypeAliasUsedAsObject.kt

@@ -0,0 +1,5 @@
+import something.T
+import something.TWC
+
+val test1 = T.hashCode()
+val test2 = TWC.hashCode()