[WIP] Add Mask2Former swin-b swin-l config files for instance segmentation

[chhluo]

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Motivation

solve #8285

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

All modified and coverable lines are covered by tests ✅

Project coverage is 64.17%. Comparing base (3b72b12) to head (bb65f29).
Report is 96 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #8491      +/-   ##
==========================================
- Coverage   64.17%   64.17%   -0.01%     
==========================================
  Files         361      361              
  Lines       29530    29530              
  Branches     5020     5020              
==========================================
- Hits        18951    18950       -1     
  Misses       9576     9576              
- Partials     1003     1004       +1     

Flag	Coverage Δ
unittests	64.14% <ø> (-0.01%)	⬇️

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