split up large rest handling file

[deads2k]

These are nothing but exact block moves because the giant rest.go made it really hard to find anything.

@kubernetes/sig-api-machinery-pr-reviews

/assign sttts
/assign caesarxuchao

[k8s-ci-robot]

@deads2k: Adding do-not-merge/release-note-label-needed because the release note process has not been followed.

One of the following labels is required "release-note", "release-note-action-required", or "release-note-none".
Please see: https://github.com/kubernetes/community/blob/master/contributors/devel/pull-requests.md#write-release-notes-if-needed.

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[sttts]

Long overdue. Assuming this is pure in-package file split.

/lgtm
/approve no-issue

[k8s-github-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: deads2k, sttts

Associated issue requirement bypassed by: sttts

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• staging/src/k8s.io/apiserver/OWNERS [deads2k,sttts]

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[fejta-bot]

/retest
This bot automatically retries jobs that failed/flaked on approved PRs (send feedback to @fejta).

Review the full test history for this PR.

[k8s-github-robot]

/test all [submit-queue is verifying that this PR is safe to merge]

[k8s-github-robot]

Automatic merge from submit-queue (batch tested with PRs 54167, 54182). If you want to cherry-pick this change to another branch, please follow the instructions here.

[k8s-ci-robot]

@deads2k: The following tests failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
pull-kubernetes-e2e-kops-aws	cd663d7	link	/test pull-kubernetes-e2e-kops-aws
pull-kubernetes-bazel-test	cd663d7	link	/test pull-kubernetes-bazel-test

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