Support fixed shape inference in pre-processing

[zhiqwang]

• Rename auto_shape to fixed_shape in YOLOTransform
• Support fixed_shape method for pre-processing

[codecov]

Codecov Report

Merging #301 (c33dd6a) into main (ff9c21b) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #301   +/-   ##
=======================================
  Coverage   94.92%   94.92%           
=======================================
  Files          11       11           
  Lines         729      729           
=======================================
  Hits          692      692           
  Misses         37       37           

Flag	Coverage Δ
unittests	94.92% <100.00%> (ø)

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Impacted Files	Coverage Δ
test/test_models_transform.py	100.00% <100.00%> (ø)
test/test_onnx.py	94.11% <100.00%> (ø)

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