[pytorch] Allows load libtroch from pip installation package

[frankfliu]

Change-Id: Ic87302a880564027bed1f213088baac1ee543d9e

Description

the default PyTorch pip package contains both cpu and gpu native binaries. Currently DJL can only load cpu/gpu only pip package:

pip install torch==1.10.0+cu113 -f https://download.pytorch.org/whl/torch_stable.html
or
pip install torch==1.10.0+cpu -f https://download.pytorch.org/whl/torch_stable.html

This PR allows DJL to load libtorch from default pip package on CPU machine. However load on GPU machine will still fail due to missing libtorch_cuda_cpp.so file in the default pip pacakge.

[codecov-commenter]

Codecov Report

Merging #1577 (168f7b7) into master (bb5073f) will decrease coverage by 1.23%.
The diff coverage is 58.26%.

@@             Coverage Diff              @@
##             master    #1577      +/-   ##
============================================
- Coverage     72.08%   70.85%   -1.24%     
- Complexity     5126     5395     +269     
============================================
  Files           473      503      +30     
  Lines         21970    23597    +1627     
  Branches       2351     2567     +216     
============================================
+ Hits          15838    16719     +881     
- Misses         4925     5598     +673     
- Partials       1207     1280      +73     

Impacted Files	Coverage Δ
api/src/main/java/ai/djl/modality/cv/Image.java	69.23% <ø> (-4.11%)	⬇️
...i/djl/modality/cv/translator/BigGANTranslator.java	21.42% <ø> (-5.24%)	⬇️
...odality/cv/translator/BigGANTranslatorFactory.java	33.33% <0.00%> (+8.33%)	⬆️
...nslator/InstanceSegmentationTranslatorFactory.java	14.28% <0.00%> (-3.90%)	⬇️
.../modality/cv/translator/YoloTranslatorFactory.java	8.33% <0.00%> (-1.67%)	⬇️
...i/djl/modality/cv/translator/YoloV5Translator.java	5.69% <0.00%> (ø)
...odality/cv/translator/YoloV5TranslatorFactory.java	8.33% <0.00%> (-1.67%)	⬇️
...pi/src/main/java/ai/djl/ndarray/BytesSupplier.java	54.54% <0.00%> (-12.13%)	⬇️
...ain/java/ai/djl/ndarray/index/dim/NDIndexPick.java	100.00% <ø> (ø)
api/src/main/java/ai/djl/nn/Blocks.java	75.00% <0.00%> (-25.00%)	⬇️
... and 229 more

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[lanking520]

Have you tested this set up? Does the jobs hang?