[Refactor] Refactor metric evaluation

[wqyin]

1. Refactor matric evaluation including MPJPE, PA-MPJPE, PCK, PCP, mAP, and recall
2. Update sample configs to control the evaluation for various datasets
3. Add a prediction matcher when the number of predicted people does not align with the number of ground-truth
4. Add the panoptic_15 convention, which is a subset of panoptic (19 keypoints)
5. Remove MVPEvaluation and add End2EndEvaluation for learning-based methods
6. Add sample config for SMPL-X estimation

[codecov-commenter]

Codecov Report

Merging #79 (2342328) into main (ef116a7) will increase coverage by 0.13%. The diff coverage is 36.25%.

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@@            Coverage Diff             @@
##             main      #79      +/-   ##
==========================================
+ Coverage   61.58%   61.71%   +0.13%     
==========================================
  Files         180      182       +2     
  Lines       11461    11681     +220     
==========================================
+ Hits         7058     7209     +151     
- Misses       4403     4472      +69     

Flag	Coverage Δ
unittests	61.71% <36.25%> (+0.13%)	:arrow_up:

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

Impacted Files	Coverage Δ
xrmocap/core/train/trainer.py	0.00% <ø> (ø)
xrmocap/model/registrant/smplify.py	85.62% <ø> (ø)
xrmocap/model/registrant/smplifyx.py	90.69% <ø> (ø)
xrmocap/core/evaluation/end2end_evaluation.py	17.24% <9.27%> (+17.24%)	:arrow_up:
...core/evaluation/metrics/precision_recall_metric.py	12.76% <12.76%> (ø)
xrmocap/core/evaluation/metrics/pcp_metric.py	14.15% <14.15%> (ø)
...nsform/convention/keypoints_convention/__init__.py	73.78% <15.38%> (-8.44%)	:arrow_down:
xrmocap/utils/mvp_utils.py	25.43% <20.00%> (+0.43%)	:arrow_up:
xrmocap/core/evaluation/base_evaluation.py	46.15% <33.33%> (+46.15%)	:arrow_up:
xrmocap/utils/eval_utils.py	68.75% <42.85%> (-21.25%)	:arrow_down:
... and 13 more

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