Feat support upload external model register

[wanglam]

Description

Support upload external model, enhance #290

Issues Resolved

List any issues this PR will resolve, e.g. Closes [...].

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.52%. Comparing base (54f8603) to head (222ab9f).

Additional details and impacted files

@@                    Coverage Diff                     @@
##           feature/model-registry     #293      +/-   ##
==========================================================
+ Coverage                   84.30%   84.52%   +0.22%     
==========================================================
  Files                         121      124       +3     
  Lines                        2453     2508      +55     
  Branches                      517      508       -9     
==========================================================
+ Hits                         2068     2120      +52     
- Misses                        292      296       +4     
+ Partials                       93       92       -1     

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