Add support for downloading .mar file

[frankfliu]

Change-Id: I58294d1d90469566464cccb28308450625e37865

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 #1338 (02361f9) into master (bb5073f) will decrease coverage by 0.55%.
The diff coverage is 54.64%.

@@             Coverage Diff              @@
##             master    #1338      +/-   ##
============================================
- Coverage     72.08%   71.53%   -0.56%     
- Complexity     5126     5144      +18     
============================================
  Files           473      478       +5     
  Lines         21970    22297     +327     
  Branches       2351     2394      +43     
============================================
+ Hits          15838    15950     +112     
- Misses         4925     5129     +204     
- Partials       1207     1218      +11     

Impacted Files	Coverage Δ
...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%)	⬇️
...n/java/ai/djl/modality/nlp/bert/BertTokenizer.java	92.68% <0.00%> (-2.32%)	⬇️
...modality/nlp/embedding/TrainableWordEmbedding.java	45.00% <0.00%> (-3.34%)	⬇️
...pi/src/main/java/ai/djl/ndarray/BytesSupplier.java	54.54% <0.00%> (-12.13%)	⬇️
...i/src/main/java/ai/djl/ndarray/NDArrayAdapter.java	15.23% <0.00%> (-0.83%)	⬇️
... and 95 more

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