modify automl threshold params and add gpu optimizations in object detection ml-wrappers

[imatiach-msft]

modify automl threshold params and add gpu optimizations in object detection ml-wrappers

1.) fix _get_device to be able to handle colons with device number
2.) add transforms to PytorchDRiseWrapper for AutoML support via extracting underlying model as an optimization for running AutoML models on GPU
3.) add threshold params for iou_thresh and score_thresh to predict method and also allow them to be specified on constructor
4.) rename score_thresh and iou_thresh to full name score_threshold and iou_threshold, since we have many cases where these seem to be inconsistent in the codebase - note it looks like these are not used elsewhere in our codebases so it should not affect other projects, but it is a breaking change in case other external users are calling these APIs directly
5.) add tests for the new changes

[codecov-commenter]

Codecov Report

Merging #144 (39cb5f8) into main (8ecf1c4) will increase coverage by 0.17%.
The diff coverage is 100.00%.

❗ Current head 39cb5f8 differs from pull request most recent head 4fa1bf2. Consider uploading reports for the commit 4fa1bf2 to get more accurate results

@@            Coverage Diff             @@
##             main     #144      +/-   ##
==========================================
+ Coverage   75.06%   75.24%   +0.17%     
==========================================
  Files          27       27              
  Lines        1793     1806      +13     
==========================================
+ Hits         1346     1359      +13     
  Misses        447      447              

Flag	Coverage Δ
unittests	75.24% <100.00%> (+0.17%)	⬆️

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Files Changed	Coverage Δ
python/ml_wrappers/model/image_model_wrapper.py	96.00% <100.00%> (+0.19%)	⬆️