wip: feature: add extender plugins

[googs1025]

fix: #1726

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[k8s-ci-robot]

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[googs1025]

No need for review now, I prefer to discuss the feasibility in issue first. This is just an implementation example

[k8s-ci-robot]

@googs1025: The following test 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-descheduler-test-e2e-k8s-master-1-34	b7498a1	link	true	/test pull-descheduler-test-e2e-k8s-master-1-34

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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