[Feature] Support FCOS3D head

[Tai-Wang]

No description provided.

[codecov]

Codecov Report

Merging #442 (a057562) into master (e1682ff) will decrease coverage by 0.68%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master     #442      +/-   ##
==========================================
- Coverage   51.05%   50.36%   -0.69%     
==========================================
  Files         187      190       +3     
  Lines       13799    14363     +564     
  Branches     2238     2346     +108     
==========================================
+ Hits         7045     7234     +189     
- Misses       6277     6640     +363     
- Partials      477      489      +12     

Flag	Coverage Δ
unittests	50.36% <33.33%> (-0.69%)	⬇️

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Impacted Files	Coverage Δ
mmdet3d/models/dense_heads/fcos_mono3d_head.py	13.10% <13.10%> (ø)
...det3d/models/dense_heads/base_mono3d_dense_head.py	42.10% <42.10%> (ø)
...et3d/models/dense_heads/anchor_free_mono3d_head.py	68.58% <68.58%> (ø)
mmdet3d/models/dense_heads/__init__.py	100.00% <100.00%> (ø)
mmdet3d/models/detectors/fcos_mono3d.py	100.00% <0.00%> (+16.66%)	⬆️

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