feat: add a draw_boxes function for detection task only

[charlesmindee]

This PR adds a draw_boxes function to draw boxes on images when performing detection task.
Partially resolves #89
Any feedback is welcome!

[codecov]

Codecov Report

Merging #384 (6633c9a) into main (7f9c305) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #384      +/-   ##
==========================================
+ Coverage   95.79%   95.84%   +0.04%     
==========================================
  Files          89       89              
  Lines        3690     3702      +12     
==========================================
+ Hits         3535     3548      +13     
+ Misses        155      154       -1     

Flag	Coverage Δ
unittests	95.84% <100.00%> (+0.04%)	⬆️

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Impacted Files	Coverage Δ
doctr/utils/visualization.py	93.63% <100.00%> (+0.77%)	⬆️
...dels/detection/differentiable_binarization/base.py	91.97% <0.00%> (+0.61%)	⬆️

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[fg-mindee]

Thanks for the PR! I added some comments

[fg-mindee]

Thanks! Just a small thing about an inplace ops

[fg-mindee]

Thanks!