git: openjdk/jdk-sandbox: json: add utilities class. Unescape throws IAE, not ISE to simplify logic

[duke]

Changeset: 7c11792c
Branch: json
Author:    Justin Lu <justin.lu at oracle.com>
Date:      2025-05-12 16:07:33 +0000
URL:       https://git.openjdk.org/jdk-sandbox/commit/7c11792ccaa7fe3e864324fbe77a742b50af6c4b

add utilities class. Unescape throws IAE, not ISE to simplify logic

! src/java.base/share/classes/java/util/json/Json.java
! src/java.base/share/classes/java/util/json/JsonObject.java
! src/java.base/share/classes/jdk/internal/util/json/JsonParser.java
! src/java.base/share/classes/jdk/internal/util/json/JsonStringImpl.java
+ src/java.base/share/classes/jdk/internal/util/json/JsonUtilities.java
! test/jdk/java/util/json/TestJsonObject.java