Support for new double colon expressions in type checker

Despite the fact that the LHS of a double colon expression is now KtExpression
instead of KtUserType, we must still consider it a type for callable references
to work. Extract and reuse relevant parts of QualifiedExpressionResolver and
TypeResolver to support this behavior

compiler/testData/diagnostics/tests/callableReference/parsingPriorityOfGenericArgumentsVsLess.kt

@@ -0,0 +1,9 @@
+package test
+
+class Foo {
+    fun <T> bar(x: Int) = x
+}
+
+fun test() {
+    Foo::<!TYPE_INFERENCE_NO_INFORMATION_FOR_PARAMETER!>bar<!> <!SYNTAX!>< <!DEBUG_INFO_MISSING_UNRESOLVED!>Int<!> ><!> <!SYNTAX!>(2 <!DEBUG_INFO_MISSING_UNRESOLVED!>+<!> 2)<!>
+}