支持jsonschema数据的fake

### 请描述您的需求或者改进建议
看到fastjson2有支持jsonschema，是否考虑把jsonschema生成fake数据的需求也加入一下；完善json系列的功能生态

### 请描述你建议的实现方案
无

### 描述您考虑过的替代方案
开源的jsongenerator，但用的人不多，star也很少

#### 附加信息
无

Start by reviewing fastjson2's existing JSON Schema support and the issue's proposed relationship to fake-data generation. Clarify the public API, supported schema features, and expected output before identifying implementation and test locations; done should include documented behavior and tests showing generated data conforms to representative schemas.

Written by the indexing model from the issue text.