[stdlib] Improve EnumEntries

* Provide short-circuit methods for contract "EnumEntries contains all
  enum entries"
* Make EnumEntries serializable
* Introduce more convenient overload for other backends

#KT-53152


Merge-request: KT-MR-6867
Merged-by: Vsevolod Tolstopyatov <qwwdfsad@gmail.com>

libraries/stdlib/src/Module.md

@@ -51,6 +51,10 @@ Low-level building blocks for libraries that provide coroutine-based APIs.
 
 Utility functions for working with the browser DOM.
 
+# Package kotlin.enum
+
+Utilities for working with Kotlin enum classes.
+
 # Package kotlin.experimental
 
 Experimental APIs, subject to change in future versions of Kotlin.