[serving] set ai.djl.pytorch.num_interop_threads

[frankfliu]

Change-Id: I9b654322e2b7505dbaa8569b6480a4f5ab19c981

Description

Brief description of what this PR is about

• If this change is a backward incompatible change, why must this change be made?
• Interesting edge cases to note here

[codecov-commenter]

Codecov Report

Merging #1059 (e038f0e) into master (05ad89a) will decrease coverage by 0.37%.
The diff coverage is 63.39%.

@@             Coverage Diff              @@
##             master    #1059      +/-   ##
============================================
- Coverage     70.36%   69.98%   -0.38%     
- Complexity     5085     5212     +127     
============================================
  Files           501      510       +9     
  Lines         22415    23255     +840     
  Branches       2325     2489     +164     
============================================
+ Hits          15772    16276     +504     
- Misses         5403     5650     +247     
- Partials       1240     1329      +89     

Impacted Files	Coverage Δ
api/src/main/java/ai/djl/Device.java	71.11% <ø> (+0.89%)	⬆️
api/src/main/java/ai/djl/ndarray/NDArray.java	73.25% <0.00%> (-1.31%)	⬇️
.../java/ai/djl/repository/RepositoryFactoryImpl.java	76.74% <0.00%> (-1.83%)	⬇️
.../src/main/java/ai/djl/repository/zoo/ModelZoo.java	54.00% <0.00%> (-18.81%)	⬇️
api/src/main/java/ai/djl/util/Platform.java	45.65% <0.00%> (-3.19%)	⬇️
.../main/java/ai/djl/zero/cv/ImageClassification.java	0.00% <0.00%> (ø)
...ine/src/main/java/ai/djl/mxnet/engine/MxModel.java	61.11% <ø> (-1.06%)	⬇️
...src/main/java/ai/djl/mxnet/engine/MxNDArrayEx.java	87.77% <ø> (ø)
...ngine/src/main/java/ai/djl/mxnet/jna/LibUtils.java	43.47% <0.00%> (-2.58%)	⬇️
...va/ai/djl/mxnet/zoo/nlp/qa/MxBertQATranslator.java	92.15% <ø> (ø)
... and 126 more

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