[Feature] Add shelf and campus datasets

[liqikai9]

Motivation

Add shelf and campus datasets for multi-view 3D pose task.

Modification

1. Add dataset info in configs/_base_/datasets/campus.py and configs/_base_/datasets/shelf.py.

2. Modified base class Kpt3dMviewRgbImgDirectDataset in mmpose/datasets/datasets/base/kpt_3d_mview_rgb_img_direct_dataset.py.
   Add Body3DMviewDirectCampusDataset in mmpose/datasets/datasets/body3d/body3d_mview_direct_campus_dataset.py and Body3DMviewDirectShelfDataset mmpose/datasets/datasets/body3d/body3d_mview_direct_shelf_dataset.py, modified related __init__.py.

3. Add related config files under configs/body/3d_kpt_mview_rgb_img/voxelpose/campus/ and configs/body/3d_kpt_mview_rgb_img/voxelpose/shelf/.

4. Add pcp metric in mmpose/core/evaluation/eval_hooks.py.

5. Add related data transforms in mmpose/datasets/pipelines/pose3d_transform.py.

BC-breaking (Optional)

Use cases (Optional)

Checklist

Before PR:

• I have read and followed the workflow indicated in the CONTRIBUTING.md to create this PR.
• Pre-commit or linting tools indicated in CONTRIBUTING.md are used to fix the potential lint issues.
• Bug fixes are covered by unit tests, the case that causes the bug should be added in the unit tests.
• New functionalities are covered by complete unit tests. If not, please add more unit tests to ensure correctness.
• The documentation has been modified accordingly, including docstring or example tutorials.

After PR:

• CLA has been signed and all committers have signed the CLA in this PR.

[codecov]

Codecov Report

Merging #1225 (2f7a37f) into dev-0.25 (c09a693) will increase coverage by 0.60%.
The diff coverage is 91.85%.

@@             Coverage Diff              @@
##           dev-0.25    #1225      +/-   ##
============================================
+ Coverage     83.44%   84.04%   +0.60%     
============================================
  Files           205      214       +9     
  Lines         16625    17507     +882     
  Branches       2976     3115     +139     
============================================
+ Hits          13872    14714     +842     
- Misses         2001     2012      +11     
- Partials        752      781      +29     

Flag	Coverage Δ
unittests	83.98% <91.85%> (+0.61%)	⬆️

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

Impacted Files	Coverage Δ
mmpose/core/evaluation/eval_hooks.py	78.12% <ø> (ø)
mmpose/datasets/__init__.py	100.00% <ø> (ø)
...ets/body3d/body3d_mview_direct_panoptic_dataset.py	81.81% <ø> (+0.44%)	⬆️
mmpose/datasets/pipelines/pose3d_transform.py	83.95% <80.00%> (+8.61%)	⬆️
...asets/body3d/body3d_mview_direct_campus_dataset.py	93.12% <93.12%> (ø)
...tasets/body3d/body3d_mview_direct_shelf_dataset.py	94.57% <94.57%> (ø)
...tasets/base/kpt_3d_mview_rgb_img_direct_dataset.py	80.74% <95.52%> (+14.07%)	⬆️
mmpose/datasets/datasets/__init__.py	100.00% <100.00%> (ø)
mmpose/datasets/datasets/body3d/__init__.py	100.00% <100.00%> (ø)
mmpose/datasets/builder.py	78.94% <0.00%> (-0.79%)	⬇️
... and 15 more

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[ly015]

Please add unit tests.