move simulator entrypoint

[YamasouA]

What type of PR is this?

What this PR does / why we need it:

There are Issue that separate API endpoint and Scheduler. First I try to move simulator entry points. (next step try to add scheduler entry points to kube-scheduler-simulator/simulator/cmd/scheduler)

Which issue(s) this PR fixes:

Part of #318

Special notes for your reviewer:

/label tide/merge-method-squash

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[k8s-ci-robot]

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[YamasouA]

I fix Docker file and pass docker build.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sanposhiho, YamasouA

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/kubernetes-sigs/kube-scheduler-simulator/blob/master/OWNERS)~~ [sanposhiho] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment