[pytorch] Adds yolov8n pose estimation model

[frankfliu]

• [api] Reactor nms for yolo translator
• [pytorch] Adds yolov8n pose estimation model

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]

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Codecov Report

Attention: Patch coverage is 89.67742% with 16 lines in your changes missing coverage. Please review.

Project coverage is 58.04%. Comparing base (725851b) to head (09d4a89).
Report is 4 commits behind head on master.

Files	Patch %	Lines
...i/djl/modality/cv/translator/YoloV5Translator.java	73.33%	8 Missing ⚠️
...ality/cv/translator/YoloPoseTranslatorFactory.java	66.66%	3 Missing and 1 partial ⚠️
...djl/modality/cv/translator/YoloPoseTranslator.java	95.16%	2 Missing and 1 partial ⚠️
...main/java/ai/djl/modality/cv/output/Rectangle.java	97.67%	0 Missing and 1 partial ⚠️

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Additional details and impacted files

@@              Coverage Diff              @@
##             master    #3298       +/-   ##
=============================================
- Coverage     72.71%   58.04%   -14.67%     
+ Complexity     7361     5771     -1590     
=============================================
  Files           677      679        +2     
  Lines         32561    32680      +119     
  Branches       3433     3450       +17     
=============================================
- Hits          23677    18970     -4707     
- Misses         7258    12253     +4995     
+ Partials       1626     1457      -169     

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