📝 Add KongNet Model and Example Notebook

[Jiaqi-Lv]

• Add KongNet Model
• Add tests
• Add example notebook (Nucleus Detector)

[review-notebook-app]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.38%. Comparing base (a20ec2b) to head (47fba14).
⚠️ Report is 2 commits behind head on dev-define-engines-abc.

Additional details and impacted files

@@                    Coverage Diff                     @@
##           dev-define-engines-abc     #987      +/-   ##
==========================================================
+ Coverage                   95.30%   95.38%   +0.08%     
==========================================================
  Files                          79       80       +1     
  Lines                        9954    10128     +174     
  Branches                     1280     1292      +12     
==========================================================
+ Hits                         9487     9661     +174     
  Misses                        431      431              
  Partials                       36       36              

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