[Feature] Release dyhead big model.

[jbwang1997]

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Motivation

Release big model of dyhead + swin-l and align performance with dyhead paper.

The results are as below,

Model	Backbone	Lr schd	Training image scale	Testing image scale	bbox
DyHead	Swin-L	2x	(2000, 480)~(2000, 1200)	(2000 1200)	56.2

The results with TTA are in progress.

Modification

Please briefly describe what modification is made in this PR.

BC-breaking (Optional)

Does the modification introduce changes that break the backward-compatibility of the downstream repos?
If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR.

Use cases (Optional)

If this PR introduces a new feature, it is better to list some use cases here, and update the documentation.

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.

[codecov]

Codecov Report

Merging #7733 (7250a15) into dev (061460c) will increase coverage by 0.08%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              dev    #7733      +/-   ##
==========================================
+ Coverage   64.75%   64.84%   +0.08%     
==========================================
  Files         346      351       +5     
  Lines       28172    28461     +289     
  Branches     4759     4807      +48     
==========================================
+ Hits        18244    18455     +211     
- Misses       8963     9023      +60     
- Partials      965      983      +18     

Flag	Coverage Δ
unittests	64.83% <ø> (+0.10%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmdet/utils/setup_env.py	92.00% <0.00%> (-8.00%)	⬇️
mmdet/core/data_structures/general_data.py	85.91% <0.00%> (-3.72%)	⬇️
mmdet/datasets/custom.py	61.25% <0.00%> (-2.68%)	⬇️
mmdet/models/dense_heads/dense_test_mixins.py	40.74% <0.00%> (-2.47%)	⬇️
mmdet/models/roi_heads/mask_heads/maskiou_head.py	87.35% <0.00%> (-2.30%)	⬇️
mmdet/models/roi_heads/test_mixins.py	50.71% <0.00%> (-2.15%)	⬇️
mmdet/datasets/builder.py	53.12% <0.00%> (-1.72%)	⬇️
mmdet/datasets/openimages.py	84.83% <0.00%> (-0.17%)	⬇️
mmdet/apis/train.py	13.68% <0.00%> (-0.05%)	⬇️
mmdet/utils/__init__.py	100.00% <0.00%> (ø)
... and 19 more

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