[KEP] Add resource policy plugin

[KunWuLuan]

/kind feature

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[k8s-ci-robot]

Hi @KunWuLuan. Thanks for your PR.

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[KunWuLuan]

releated to #475

[ffromani]

/cc

[KunWuLuan]

@denkensk @Huang-Wei Hi, if you have time, you can help to review the kep, thanks very much. 😆

[ffromani]

/ok-to-test

It's a bit of a crazy time for me but I'll try to also add my (non-binding) review

[Huang-Wei]

I will try to review it by this week.

[KunWuLuan]

Hi, @Huang-Wei , This PR is ready for review. PTAL. Thanks for your time. : )

[KunWuLuan]

There is a known issue, when the number of nodes in cluster is larger than 100, scheduler will not find all feasible nodes unless percentageOfNodesToScore is set to 100. This can make resource policy lose efficacy.

[ffromani]

initial pass (sorry for the long delay)
at glance looks sensible, will be asking questions to fully grasp the proposal

[netlify]

✅ Deploy Preview for kubernetes-sigs-scheduler-plugins canceled.

Name	Link
🔨 Latest commit	5062e58
🔍 Latest deploy log	https://app.netlify.com/sites/kubernetes-sigs-scheduler-plugins/deploys/6603b72d49bb010008f983aa

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: KunWuLuan
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[KunWuLuan]

@ffromani @Huang-Wei Hi, do you have any other questions?

[ffromani]

The main blocker atm is that the KEP template is not fully filled (e.g. PostFilter - do we need it? Do we have Graduation criterias? Do we need Production Readiness? [probably not] We probably need a few words in Feature enablement and rollback though)

From what I've read so far I have no major objections. About the architecture and the fitness of this plugin in the existing ecosystem I'd have to defer to someone more experience in the scheduling.

[KunWuLuan]

The main blocker atm is that the KEP template is not fully filled (e.g. PostFilter - do we need it? Do we have Graduation criterias? Do we need Production Readiness? [probably not] We probably need a few words in Feature enablement and rollback though)

From what I've read so far I have no major objections. About the architecture and the fitness of this plugin in the existing ecosystem I'd have to defer to someone more experience in the scheduling.

Thanks! I will add these part.

[KunWuLuan]

Have updated the kep

[KunWuLuan]

for #475

[KunWuLuan]

@ffromani @Huang-Wei Hi, please have a look when u have time. Thanks for your time. : )

[k8s-ci-robot]

@KunWuLuan: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-scheduler-plugins-integration-test-master	5062e58	link	true	/test pull-scheduler-plugins-integration-test-master
pull-scheduler-plugins-unit-test-master	5062e58	link	true	/test pull-scheduler-plugins-unit-test-master

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