Deprecate ImageToTensor in image_demo

[hhaAndroid]

Deprecate ImageToTensor in image_demo

Resolves #4091
Resolves #4146

[codecov]

Codecov Report

Merging #4400 (8e8eabc) into master (9cb5543) will decrease coverage by 0.01%.
The diff coverage is 25.00%.

@@            Coverage Diff             @@
##           master    #4400      +/-   ##
==========================================
- Coverage   61.94%   61.92%   -0.02%     
==========================================
  Files         239      239              
  Lines       18267    18274       +7     
  Branches     3060     3063       +3     
==========================================
+ Hits        11315    11316       +1     
- Misses       6402     6408       +6     
  Partials      550      550              

Flag	Coverage Δ
unittests	61.88% <25.00%> (-0.02%)	⬇️

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Impacted Files	Coverage Δ
mmdet/apis/inference.py	20.00% <25.00%> (+0.45%)	⬆️
mmdet/models/dense_heads/corner_head.py	74.45% <0.00%> (-0.41%)	⬇️
mmdet/models/dense_heads/cascade_rpn_head.py	28.07% <0.00%> (-0.20%)	⬇️

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