[Feature] Add gt_edge_map field.

[274869388]

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Motivation

The motivation of this PR is to add gt_edge_map field to support boundary loss.

Modification

• GenerateEdge
  Modify gt_edge field to gt_edge_map.

• PackSegInputs
  Add gt_edge_map to data_sample.

• stack_batch
  Pad gt_edge_map to max_shape.

BC-breaking (Optional)

No

Use cases (Optional)

Reference GenerateEdge.

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 MMDet3D.
4. The documentation has been modified accordingly, like docstring or example tutorials.

[codecov]

Codecov Report

Base: 83.44% // Head: 83.38% // Decreases project coverage by -0.05% ⚠️

Coverage data is based on head (c595974) compared to base (f90f7a5).
Patch coverage: 12.50% of modified lines in pull request are covered.

❗ Current head c595974 differs from pull request most recent head c1c00bf. Consider uploading reports for the commit c1c00bf to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x    #2466      +/-   ##
===========================================
- Coverage    83.44%   83.38%   -0.06%     
===========================================
  Files          145      145              
  Lines         8425     8432       +7     
  Branches      1257     1259       +2     
===========================================
+ Hits          7030     7031       +1     
- Misses        1189     1193       +4     
- Partials       206      208       +2     

Flag	Coverage Δ
unittests	83.38% <12.50%> (-0.06%)	⬇️

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

Impacted Files	Coverage Δ
mmseg/datasets/transforms/formatting.py	88.88% <0.00%> (-8.09%)	⬇️
mmseg/utils/misc.py	87.50% <0.00%> (-7.96%)	⬇️
mmseg/datasets/transforms/transforms.py	91.08% <100.00%> (+0.13%)	⬆️

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