Add JSON encoding and decoding (#14021)

Author: josevalim

NOTICE

@@ -3,9 +3,10 @@ LEGAL NOTICE INFORMATION
 
 All the files in this distribution are copyright to the terms below.
 
+== lib/elixir/src/elixir_json.erl
 == lib/elixir/src/elixir_parser.erl (generated by build scripts)
 
-Copyright Ericsson AB 1996-2015
+Copyright Ericsson AB 1996-2024
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.