Migrate QARepVGG from YOLOv6 to MMYOLO

[xin-li-67]

Motivation

Migrate the QARepVGG implementation from the official YOLOv6 repository and the deployment process using both the easydeploy and MMDeploy.

Modification

configs/yolov6/qarepvgg/*
mmyolo/models/layers/init.py
mmyolo/models/layers/yolo_bricks.py
mmyolo/utils/misc.py
projects/easydeploy/

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 potential lint issues.
2. The modification is covered by complete unit tests. If not, please add more unit tests to ensure the correctness.
3. If the modification has a potential influence on downstream projects, this PR should be tested with downstream projects, like MMDetection or MMClassification.
4. The documentation has been modified accordingly, like docstring or example tutorials.