Custom imports

[Johnson-Wang]

Allow manually importing modules specified in the config files instead of modifying the __init__.py file.

[codecov]

Codecov Report

Merging #3641 into master will increase coverage by 0.09%.
The diff coverage is 65.00%.

@@            Coverage Diff             @@
##           master    #3641      +/-   ##
==========================================
+ Coverage   60.85%   60.94%   +0.09%     
==========================================
  Files         205      205              
  Lines       13809    13827      +18     
  Branches     2341     2344       +3     
==========================================
+ Hits         8403     8427      +24     
+ Misses       4977     4971       -6     
  Partials      429      429              

Flag	Coverage Δ
#unittests	60.94% <65.00%> (+0.09%)	⬆️

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Impacted Files	Coverage Δ
mmdet/apis/inference.py	20.73% <16.66%> (-0.05%)	⬇️
mmdet/datasets/pipelines/loading.py	50.86% <84.61%> (+2.74%)	⬆️
mmdet/datasets/pipelines/__init__.py	100.00% <100.00%> (ø)
mmdet/models/roi_heads/mask_heads/maskiou_head.py	97.87% <0.00%> (+5.31%)	⬆️
mmdet/models/roi_heads/mask_scoring_roi_head.py	100.00% <0.00%> (+18.42%)	⬆️

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