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

compiler/testData/codegen/boxWithJava/enum/staticField.java

@@ -0,0 +1,12 @@
+package test;
+
+import java.util.Set;
+import java.util.EnumSet;
+
+public enum staticField {
+    INSTANCE;
+    
+    public static int foo = 42;
+    
+    public static final Set<staticField> INSTANCES = EnumSet.of(INSTANCE);
+}