[Feature] Support YOLOX-PAI 3.x

[okotaku]

Motivation

YOLOX-PAI for dev-3.x

Related PR: https://github.com/open-mmlab/mmdetection/pull/8778 https://github.com/open-mmlab/mmclassification/pull/1126

Checklist

1. Pre-commit or other linting tools are used to fix the potential lint issues.
2. The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
3. If the modification has potential influence on downstream projects, this PR should be tested with downstream projects, like MMDet or MMCls.
4. The documentation has been modified accordingly, like docstring or example tutorials.

[ZwwWayne]

Hi @okotaku , Thanks for your kind PR. It seems that there are some unrelated modifications, would you like to rebase your code onto the most recent dev-3.x?

[hhaAndroid]

@okotaku Thanks for your kind contribution. Is this precision already aligned?

[okotaku]

@hhaAndroid Yes.