WIP: support cel selector

[haoqing0110]

Summary

Related issue(s)

Fixes #

[codecov]

Codecov Report

Attention: Patch coverage is 81.00000% with 38 lines in your changes missing coverage. Please review.

Project coverage is 63.96%. Comparing base (9eb8131) to head (fc97656).
Report is 19 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/placement/helpers/cel.go	84.04%	21 Missing and 9 partials ⚠️
...nt/controllers/scheduling/scheduling_controller.go	11.11%	6 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #693      +/-   ##
==========================================
+ Coverage   63.33%   63.96%   +0.62%     
==========================================
  Files         187      193       +6     
  Lines       17921    18796     +875     
==========================================
+ Hits        11351    12022     +671     
- Misses       5635     5783     +148     
- Partials      935      991      +56     

Flag	Coverage Δ
unit	63.96% <81.00%> (+0.62%)	⬆️

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[qiujian16]

I would consider a CEL based selector, which could be more flexible.
e.g. could reference a score value

[openshift-ci]

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