koord-scheduler: ElasticQuota supports Decorator to decorate Node, Pod and ElasticQuota

[eahydra]

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

Ⅰ. Describe what this PR does

ElasticQuota scheduling plugin supports Decorator interface to decorate Node, Pod and ElasticQuota as needed.
For example, if you want to append some additional resources into Node, Pod and ElasticQuota such as GPU Resources or modify Spec by GPU model, you can implement the Decorator interface.

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

V. Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests
• All checks passed in make test

[eahydra]

@xulinfei1996

[buptcozy]

/approve

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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[codecov]

Codecov Report

Base: 67.64% // Head: 67.56% // Decreases project coverage by -0.08% ⚠️

Coverage data is based on head (b83bc0e) compared to base (6b43770).
Patch coverage: 29.31% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #857      +/-   ##
==========================================
- Coverage   67.64%   67.56%   -0.09%     
==========================================
  Files         224      225       +1     
  Lines       25581    25631      +50     
==========================================
+ Hits        17305    17318      +13     
- Misses       7075     7114      +39     
+ Partials     1201     1199       -2     

Flag	Coverage Δ
unittests	67.56% <29.31%> (-0.09%)	⬇️

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

Impacted Files	Coverage Δ
...g/scheduler/plugins/elasticquota/core/decorator.go	0.00% <0.00%> (ø)
pkg/scheduler/plugins/elasticquota/plugin.go	69.06% <62.50%> (-1.09%)	⬇️
pkg/scheduler/plugins/elasticquota/node_handler.go	67.18% <100.00%> (ø)
pkg/scheduler/plugins/elasticquota/pod_handler.go	67.74% <100.00%> (+3.45%)	⬆️
pkg/scheduler/plugins/elasticquota/preempt.go	40.96% <100.00%> (+0.23%)	⬆️
...kg/scheduler/plugins/elasticquota/quota_handler.go	77.08% <100.00%> (+1.52%)	⬆️
pkg/util/httputil/reverseproxy.go	84.84% <0.00%> (-0.27%)	⬇️
pkg/koordlet/runtimehooks/reconciler/reconciler.go	67.05% <0.00%> (+1.17%)	⬆️
pkg/koordlet/statesinformer/states_pods.go	56.73% <0.00%> (+2.12%)	⬆️

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[buptcozy]

/lgtm

[FillZpp]

/milestone v1.1