JSONWriter.Feature.WriteLongAsString会把Integer类型的值转为字符串

### 请描述您的问题
依赖：fastjson2-extension-spring6
版本：2.0.52
问题：使用JSONWriter.Feature.WriteLongAsString的过程中发现会把Integer类型的值也给转为字符串，但按方法名来看 不是把Long类型的值转为String吗

Start by reproducing the behavior in the fastjson2-extension-spring6 dependency at version 2.0.52 with JSONWriter.Feature.WriteLongAsString. Check the serialization output for Integer and Long values; done means Integer remains numeric while Long is serialized as a string, with regression coverage added for both cases.

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