Feat/update json validator

[sealbell]

👀 Purpose and Importance of this PR:

• My code conforms to the coding style of this project.
• My code requires changes to the documentation.
• I have updated the documentation accordingly.
• All tests have passed.

🅰 Fixes for Issues:

Fixes 验证生成的 JSON 数据的格式和完整性，确保其符合预期的结构和内容。 #4

📝 Notes for the Reviewer:

This PR includes two main changes:

1. Feature Update: The json_validator.py file has been updated to support flexible timestamp field names. The change_timestamp_format function can now handle any specified timestamp field name, making it more versatile.
2. Testing: New tests have been added to test_file_processing.py to verify the functionality of the updated change_timestamp_format function with different field names.

🎯 How to Verify this PR:

• Run the unit tests included in the tests/test_file_processing.py file to ensure that all tests pass and the new functionality works as expected.
• Review the changes in ai_commons/file_processing/json_validator.py to understand the implementation of the flexible timestamp handling.

📑 Additional Documentation, e.g., KEPs (Telepace Enhancement Proposals), Usage Docs, etc.:

N/A

[cubxxw]

需要考虑多种 timestamp 的传入格式，

或者在这里设定一下约束：我们的数据收集层如何收集指定的约束 timestamp 字段

建议参考其他的优质开源项目如何做的。

如何对时间戳进行处理。

[cubxxw]

这个 PR 决定不合并

[kubbot]

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This PR has been decided not to be merged