Chore: Add codeowner

[chivalryq]

Description of your changes

Add @chivalryq as codeowner.

Fixes #

I have:

• Read and followed KubeVela's contribution process.
• Related Docs updated properly. In a new feature or configuration option, an update to the documentation is necessary.
• Run yarn lint to ensure the frontend changes are ready for review.
• Run make reviewableto ensure the server changes are ready for review.
• Added backport release-x.y labels to auto-backport this PR if necessary.

Special notes for your reviewer

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +11.74 🎉

Comparison is base (04aa7e9) 49.19% compared to head (370d008) 60.93%.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #840       +/-   ##
===========================================
+ Coverage   49.19%   60.93%   +11.74%     
===========================================
  Files         110      110               
  Lines       19406    19406               
===========================================
+ Hits         9546    11826     +2280     
+ Misses       8612     6118     -2494     
- Partials     1248     1462      +214     

Flag	Coverage Δ
apiserver-unittests	33.86% <ø> (?)
server-e2e-tests	49.22% <ø> (+0.03%)	⬆️

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see 44 files with indirect coverage changes

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