[JDL/枚举]: 使用特殊字符时的解析问题 / 导出时缺少引号 / 使用枚举进行 JDL 注入

Overview of the issue

Summary: There are several issues with the jdl query parser, the way enum values are stored internally and on export

• Enums like QUOTES("\"") or COMMA_SPACE (", ") , both correctly escaped and quoted, can't be imported
• Enums with special chars won't be exported correctly. Jhipster export jdl generated no quotes for special characters.
• Even JDL-injection with enums is possible causes by the way how enum values are stored internally.

Examples and steps to reproduce:

Example 1: Missing quotes on export and Enum injection