Update CODEOWNERS

[khanhtc1202]

What this PR does:

Create teams for approvers, and update codeowener to specify who can approve code changes in which dir

Why we need it:

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

• How are users affected by this change:
• Is this breaking change:
• How to migrate (if breaking change):

[Warashi]

👍🏻

[t-kikuc]

pipecd-approvers-web！

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 28.05%. Comparing base (a6bf12e) to head (021ebcd).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5869   +/-   ##
=======================================
  Coverage   28.05%   28.05%           
=======================================
  Files         510      510           
  Lines       54420    54420           
=======================================
  Hits        15267    15267           
  Misses      37997    37997           
  Partials     1156     1156           

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