koord-scheduler: make initialization scalable

[eahydra]

Signed-off-by: Joseph joseph.t.lee@outlook.com

Ⅰ. Describe what this PR does

Maintain plugin list separately for easy expansion.

[ZiMengSheng]

/lgtm

[codecov]

Codecov Report

Base: 67.95% // Head: 67.90% // Decreases project coverage by -0.05% ⚠️

Coverage data is based on head (5e470bc) compared to base (b401d54).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #832      +/-   ##
==========================================
- Coverage   67.95%   67.90%   -0.06%     
==========================================
  Files         216      216              
  Lines       24387    24387              
==========================================
- Hits        16573    16560      -13     
- Misses       6666     6678      +12     
- Partials     1148     1149       +1     

Flag	Coverage Δ
unittests	67.90% <ø> (-0.06%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/koordlet/runtimehooks/reconciler/reconciler.go	71.57% <0.00%> (-7.37%)	⬇️
pkg/koordlet/statesinformer/states_pods.go	54.60% <0.00%> (-2.13%)	⬇️
pkg/util/httputil/reverseproxy.go	84.30% <0.00%> (-0.80%)	⬇️

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[FillZpp]

/lgtm

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: FillZpp, ZiMengSheng

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[FillZpp]

/milestone v1.1