support return heatmaps and features for bottom-up models

[jin-s13]

support return heatmaps and features for bottom-up models

[codecov]

Codecov Report

Merging #229 into master will decrease coverage by 0.25%.
The diff coverage is 86.53%.

@@            Coverage Diff             @@
##           master     #229      +/-   ##
==========================================
- Coverage   83.31%   83.05%   -0.26%     
==========================================
  Files         108      112       +4     
  Lines        6400     6456      +56     
  Branches     1030     1029       -1     
==========================================
+ Hits         5332     5362      +30     
- Misses        867      901      +34     
+ Partials      201      193       -8     

Flag	Coverage Δ
unittests	83.05% <86.53%> (-0.26%)	⬇️

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

Impacted Files	Coverage Δ
mmpose/datasets/__init__.py	100.00% <ø> (ø)
...pose/datasets/datasets/bottom_up/bottom_up_coco.py	48.32% <ø> (ø)
mmpose/datasets/datasets/top_down/__init__.py	100.00% <ø> (ø)
...datasets/datasets/top_down/topdown_mpii_dataset.py	42.71% <ø> (ø)
mmpose/models/backbones/utils/utils.py	50.00% <ø> (ø)
mmpose/models/detectors/mesh.py	92.24% <ø> (ø)
mmpose/models/detectors/top_down.py	77.91% <ø> (ø)
mmpose/models/losses/mesh_loss.py	97.65% <ø> (ø)
mmpose/utils/hooks.py	44.44% <0.00%> (-2.62%)	⬇️
mmpose/apis/inference.py	65.83% <47.36%> (-2.38%)	⬇️
... and 16 more

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