K1/K2: add Enum.entries unconditionally and filter them out in tower

Before this commit, we added Enum.entries only in case when
LanguageFeature.EnumEntries was ON (with an exception in K1/Java case).
In this commit we add Enum.entries unconditionally, and in case
the language feature is OFF we filter them out during tower resolve.

compiler/testData/loadJava/compiledJava/static/Enum.fir.txt

@@ -8,6 +8,9 @@ public final enum class Enum : R|kotlin/Enum<test/Enum!>| {
     public final static fun valueOf(value: R|kotlin/String|): R|test/Enum| {
     }
 
+    public final static val entries: R|kotlin/enums/EnumEntries<test/Enum>|
+        public get(): R|kotlin/enums/EnumEntries<test/Enum>|
+
     public open inner class Inner : R|kotlin/Any| {
         public/*package*/ open fun bar(): R|kotlin/Unit|
 

compiler/testData/loadJava/compiledJava/static/StaticMembersInEnum.fir.txt

@@ -16,4 +16,7 @@ public final enum class StaticMembersInEnum : R|kotlin/Enum<test/StaticMembersIn
     public final static fun valueOf(value: R|kotlin/String|): R|test/StaticMembersInEnum| {
     }
 
+    public final static val entries: R|kotlin/enums/EnumEntries<test/StaticMembersInEnum>|
+        public get(): R|kotlin/enums/EnumEntries<test/StaticMembersInEnum>|
+
 }