open isImage() method to package children for reuse-enabling custom datasets

[juliangamble]

Description

open isImage() method to package children for reuse - enabling custom datasets

[codecov-commenter]

Codecov Report

Patch coverage: 70.98% and project coverage change: +1.56 🎉

Comparison is base (bb5073f) 72.08% compared to head (6622f21) 73.65%.

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Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2662      +/-   ##
============================================
+ Coverage     72.08%   73.65%   +1.56%     
- Complexity     5126     6979    +1853     
============================================
  Files           473      685     +212     
  Lines         21970    30457    +8487     
  Branches       2351     3157     +806     
============================================
+ Hits          15838    22434    +6596     
- Misses         4925     6491    +1566     
- Partials       1207     1532     +325     

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)
.../main/java/ai/djl/modality/cv/output/Landmark.java	100.00% <ø> (ø)
...djl/modality/cv/transform/RandomFlipLeftRight.java	25.00% <0.00%> (-25.00%)	⬇️
...djl/modality/cv/transform/RandomFlipTopBottom.java	25.00% <0.00%> (-25.00%)	⬇️
...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%)	⬆️
...ain/java/ai/djl/modality/cv/util/NDImageUtils.java	67.10% <0.00%> (+7.89%)	⬆️
api/src/main/java/ai/djl/modality/nlp/Decoder.java	63.63% <ø> (ø)
... and 228 more

... and 354 files with indirect coverage changes

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