Use eslint v9 and flat config

[harryzcy]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 20.69%. Comparing base (aa643d0) to head (b5f0eeb).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1739   +/-   ##
=======================================
  Coverage   20.69%   20.69%           
=======================================
  Files          15       15           
  Lines         430      430           
=======================================
  Hits           89       89           
  Misses        335      335           
  Partials        6        6           

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