feat(repo): Implement Repository Update Command

[bhavyaKhatri2703]

fixes #710

This pr adds a repo update command which can update the description of a repository.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 49 lines in your changes missing coverage. Please review.
✅ Project coverage is 7.21%. Comparing base (60ad0bd) to head (7f4f12a).
⚠️ Report is 98 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/harbor/root/repository/update.go	0.00%	34 Missing ⚠️
pkg/api/repository_handler.go	0.00%	14 Missing ⚠️
cmd/harbor/root/repository/cmd.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             main    #714      +/-   ##
=========================================
- Coverage   10.99%   7.21%   -3.78%     
=========================================
  Files         173     261      +88     
  Lines        8671   12962    +4291     
=========================================
- Hits          953     935      -18     
- Misses       7612   11919    +4307     
- Partials      106     108       +2     

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