refactor: improve pydantic json dump

[waketzheng]

Description

Currently JSONField use model_dump+JSON_DUMPS for pydantic model dumping, we can use model_dump_json to improve performance.

Motivation and Context

FastAPI say that Serialize JSON response with Pydantic results in 2x (or more) performance increase for JSON responses https://github.com/fastapi/fastapi/releases/tag/0.130.0

How Has This Been Tested?

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added the changelog accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codspeed-hq]

Merging this PR will not alter performance

✅ 24 untouched benchmarks

---

_{Comparing waketzheng:improve-pydantic-json-dump (7027d1d) with develop (314273c)}