port serviceaccount token volume design proposal to KEP

[zshihang]

this PR is a copy of the pre-existing design proposal kubernetes/community#1973 and we would like to convert the design proposal into this KEP and iterate on it. more changes can be expected in subsequent PRs to this KEP with the goal of GA this feature which provides nice security properties.

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[zshihang]

/cc mikedanese

[mikedanese]

This turns the proposal here: https://github.com/kubernetes/community/blob/e3a6b8172fec9506b15520549e52be683e30cbfb/contributors/design-proposals/storage/svcacct-token-volume-source.md into a KEP so we can prepare for GA.

[mikedanese]

/lgtm
/cc @liggitt @smarterclayton
/assgin @jsafrane @saad-ali

[liggitt]

lgtm as a port of the original design, would recommend adding the original reviewers/approvers to the doc

would like to merge this as-is (since it's a move of a historical document), then iterate on the migration plan

[zshihang]

/ok-to-test

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[saad-ali]

Thanks for the clarification. No objections to porting design doc to KEP and iterating on it.

/lgtm

[saad-ali]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mikedanese, saad-ali, zshihang

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