[onnx] Adds yolov8n to model zoo

[frankfliu]

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

Attention: 1333 lines in your changes are missing coverage. Please review.

Comparison is base (bb5073f) 72.08% compared to head (9e4a859) 72.57%.
Report is 941 commits behind head on master.

Files	Patch %	Lines
...va/ai/djl/modality/nlp/generate/TextGenerator.java	2.81%	276 Missing ⚠️
.../java/ai/djl/modality/nlp/generate/SeqBatcher.java	0.75%	132 Missing ⚠️
...ity/nlp/generate/ContrastiveSeqBatchScheduler.java	2.97%	98 Missing ⚠️
...i/djl/modality/nlp/generate/SeqBatchScheduler.java	9.83%	55 Missing ⚠️
.../java/ai/djl/modality/cv/BufferedImageFactory.java	40.96%	47 Missing and 2 partials ⚠️
...a/ai/djl/modality/nlp/generate/StepGeneration.java	2.04%	48 Missing ⚠️
api/src/main/java/ai/djl/ndarray/NDArray.java	43.42%	39 Missing and 4 partials ⚠️
...n/java/ai/djl/modality/cv/output/CategoryMask.java	22.00%	39 Missing ⚠️
...i/src/main/java/ai/djl/ndarray/NDArrayAdapter.java	71.21%	31 Missing and 7 partials ⚠️
.../cv/translator/SemanticSegmentationTranslator.java	37.50%	35 Missing ⚠️
... and 75 more

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Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2909      +/-   ##
============================================
+ Coverage     72.08%   72.57%   +0.48%     
- Complexity     5126     7204    +2078     
============================================
  Files           473      708     +235     
  Lines         21970    32023   +10053     
  Branches       2351     3337     +986     
============================================
+ Hits          15838    23242    +7404     
- Misses         4925     7187    +2262     
- Partials       1207     1594     +387     

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