Fix broken isEnumClassObject methods

Out of three methods, two were incorrect
Resolve static enum members from compiled Java

For static members, a corresponding package is now created for every enum, as
it's done for every other class. All static members of enum classes are
resolved into the package, EXCEPT its enum entries, valueOf() and values()
methods, which are put into the enum's class descriptor.
Resolve static methods of enum in front-end

Up to this point, front-end did not suspect that there could be classes which
have both a class object and a package for static members. Since this became
possible for enums loaded from Java binaries (enum entries and valueOf()/
values() are placed into the class object, and every other static member into
the package), we adjust the corresponding scope to also include members from
the corresponding package

 #KT-2990 Fixed