Workaround on YOLOTransform to support fixed size input

[zhiqwang]

This will introduce backward-incompatible updates, we use the size (Tuple[int, int]) parameter in YOLOModule instead of min_size (int) and max_size (int).

Ref: pytorch/vision@2d0f267

[codecov]

Codecov Report

Merging #109 (2e61ea9) into master (97c8ab7) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #109   +/-   ##
=======================================
  Coverage   83.54%   83.54%           
=======================================
  Files           8        8           
  Lines         784      784           
=======================================
  Hits          655      655           
  Misses        129      129           

Flag	Coverage Δ
unittests	83.54% <100.00%> (ø)

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Impacted Files	Coverage Δ
test/test_engine.py	100.00% <100.00%> (ø)
test/test_onnx.py	87.95% <100.00%> (ø)

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