[pytorch] Add system property to config GraphExecutorOptimize

[KexinFeng]

Add system property to config GraphExecutorOptimize. If true, during inference, an initial warm up in the first inference will be needed, which cost ~3.6s latency. With GraphExecutorOptimize=True, the rest of the latencies are reduced.

This seems to have apparent effect on resnet18 on gpu, while other models are not much affected.

This utilizes setGraphExecutorOptimize relavant PR #904
Solves the issue #2151
#2153

Update:
Tested in gpu docker image.

[codecov-commenter]

Codecov Report

Base: 72.08% // Head: 71.52% // Decreases project coverage by -0.56% ⚠️

Coverage data is based on head (3cb8a0e) compared to base (bb5073f).
Patch coverage: 72.07% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2156      +/-   ##
============================================
- Coverage     72.08%   71.52%   -0.57%     
- Complexity     5126     6339    +1213     
============================================
  Files           473      626     +153     
  Lines         21970    27972    +6002     
  Branches       2351     3017     +666     
============================================
+ Hits          15838    20006    +4168     
- Misses         4925     6492    +1567     
- Partials       1207     1474     +267     

Impacted Files	Coverage Δ
api/src/main/java/ai/djl/modality/cv/Image.java	69.23% <ø> (-4.11%)	⬇️
...rc/main/java/ai/djl/modality/cv/MultiBoxPrior.java	76.00% <ø> (ø)
...rc/main/java/ai/djl/modality/cv/output/Joints.java	71.42% <ø> (ø)
.../main/java/ai/djl/modality/cv/output/Landmark.java	100.00% <ø> (ø)
...main/java/ai/djl/modality/cv/output/Rectangle.java	72.41% <0.00%> (ø)
...i/djl/modality/cv/translator/BigGANTranslator.java	21.42% <0.00%> (-5.24%)	⬇️
.../modality/cv/translator/ImageFeatureExtractor.java	0.00% <0.00%> (ø)
.../ai/djl/modality/cv/translator/YoloTranslator.java	27.77% <0.00%> (+18.95%)	⬆️
...modality/cv/translator/wrapper/FileTranslator.java	44.44% <ø> (ø)
...y/cv/translator/wrapper/InputStreamTranslator.java	44.44% <ø> (ø)
... and 560 more

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