Improvements to image coloring

[JohnDoll2023]

Description

Brief description of what this PR is about

• Added random color array to remove need for specifying specific id's for objects
• Improved efficiency of coloring algorithm
• Resize array in translator to original image dimensions

[codecov-commenter]

Codecov Report

Merging #1784 (7c76aa8) into master (bb5073f) will decrease coverage by 2.49%.
The diff coverage is 65.08%.

@@             Coverage Diff              @@
##             master    #1784      +/-   ##
============================================
- Coverage     72.08%   69.59%   -2.50%     
- Complexity     5126     5490     +364     
============================================
  Files           473      524      +51     
  Lines         21970    24316    +2346     
  Branches       2351     2644     +293     
============================================
+ Hits          15838    16923    +1085     
- Misses         4925     6082    +1157     
- Partials       1207     1311     +104     

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% <ø> (-5.24%)	⬇️
...odality/cv/translator/BigGANTranslatorFactory.java	33.33% <0.00%> (+8.33%)	⬆️
...nslator/InstanceSegmentationTranslatorFactory.java	14.28% <0.00%> (-3.90%)	⬇️
.../cv/translator/SemanticSegmentationTranslator.java	0.00% <0.00%> (ø)
.../cv/translator/StyleTransferTranslatorFactory.java	40.00% <ø> (ø)
... and 414 more

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