[xgb] Add GPU support for XGBoost

[frankfliu]

Upgrade XGBoost to 1.6.1

Change-Id: Id6a6cc911e4a382ccaa94a962d89fad6208c48fc

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 #1680 (bbc6991) into master (bb5073f) will decrease coverage by 1.40%.
The diff coverage is 61.61%.

@@             Coverage Diff              @@
##             master    #1680      +/-   ##
============================================
- Coverage     72.08%   70.68%   -1.41%     
- Complexity     5126     5454     +328     
============================================
  Files           473      510      +37     
  Lines         21970    24049    +2079     
  Branches       2351     2619     +268     
============================================
+ Hits          15838    17000    +1162     
- Misses         4925     5740     +815     
- Partials       1207     1309     +102     

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/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% <ø> (ø)
...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%)	⬇️
.../ai/djl/modality/cv/translator/YoloTranslator.java	8.33% <0.00%> (-0.50%)	⬇️
.../modality/cv/translator/YoloTranslatorFactory.java	8.33% <0.00%> (-1.67%)	⬇️
...i/djl/modality/cv/translator/YoloV5Translator.java	5.38% <0.00%> (-0.31%)	⬇️
... and 249 more

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