[feat] Add Dino

[tchaton]

What does this PR do?

Fixes # (issue)

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[codecov]

Codecov Report

Merging #259 (941911a) into master (8007c26) will decrease coverage by 0.22%.
The diff coverage is 70.00%.

@@            Coverage Diff             @@
##           master     #259      +/-   ##
==========================================
- Coverage   87.37%   87.14%   -0.23%     
==========================================
  Files          62       62              
  Lines        3294     3313      +19     
==========================================
+ Hits         2878     2887       +9     
- Misses        416      426      +10     

Flag	Coverage Δ
unittests	87.14% <70.00%> (-0.23%)	⬇️

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

Impacted Files	Coverage Δ
flash/vision/backbones.py	79.61% <64.70%> (-2.95%)	⬇️
flash/vision/classification/model.py	96.29% <100.00%> (+0.29%)	⬆️
flash/video/classification/data.py	73.03% <0.00%> (-4.50%)	⬇️

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