Added pre-trained weights for ShuffleNetV2 x1.5 and x2.0

[raember]

Pre-trained shufflenetv2 (x1.5 and x2.0) not being supported links to an issue about adding more pre-trained weights, which has a link to a merged PR adding them to the repo, which in turn links the missing weights.

Closes #524

[RangiLyu]

Thanks for your contribution!

[codecov[bot]]

Codecov Report

Merging #526 (6482faa) into main (3c9607c) will decrease coverage by 0.03%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #526      +/-   ##
==========================================
- Coverage   74.78%   74.76%   -0.03%     
==========================================
  Files          71       71              
  Lines        4695     4695              
  Branches      731      731              
==========================================
- Hits         3511     3510       -1     
  Misses        987      987              
- Partials      197      198       +1     

Flag	Coverage Δ
unittests	74.76% <ø> (-0.03%)	:arrow_down:

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Files Changed	Coverage Δ
nanodet/model/backbone/shufflenetv2.py	92.07% <ø> (-1.00%)	:arrow_down:

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[RangiLyu]

lint failure has nothing to do with this PR. merged