[Feature] Support DETRs with Hybrid Matching

[okotaku]

Motivation

DETRs with Hybrid Matching
official repo

Result

Backbone	Model	Lr schd	box AP
R-50	Deformable DETR + trick	1x	47.1
R-50	DETRs with Hybrid Matching	1x	48.6

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.

[CLAassistant]

All committers have signed the CLA.

[jshilong]

Would you mind making the original two-stage deformable-detr as base then we can notice all modifications which indicate the tricks

[jshilong]

Thanks for your great work!
You may have found PRs about DINO, Conditional DETR, and DAB-DETR. We will discuss the sequence of this pr and DINO and will keep you informed, thank you again for your contribution

[PkuRainBow]

@okotaku Thanks a lot for your help in creating PR for our HDETR!

It would be great if you could check our latest repo based on MMdetection:

https://github.com/HDETR/H-Deformable-DETR-mmdet/tree/mmdetection-with-plug-in

We would really appreciate your efforts if you could help migrate the complete implementations and pre-trained checkpoints!

[okotaku]

@PkuRainBow Thank you for your sharing! It sounds good. I will try it after refactoring of DETRs.