KEP-5729: DRA: ResourceClaim Support for Workloads

[nojnhuh]

• One-line PR description: Add initial draft for KEP-5729: DRA: ResourceClaim Support for Workloads

• Issue link: DRA: ResourceClaim Support for Workloads #5729

• Other comments:

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@nojnhuh: 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-enhancements-test	56fa8cf	link	true	/test pull-enhancements-test
pull-enhancements-verify	56fa8cf	link	true	/test pull-enhancements-verify

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[nojnhuh]

I'm ready for feedback on the Summary and Motivation sections. Mostly want to make sure this is appropriately scoped w.r.t. #5732.

/cc @wojtek-t @erictune @44past4 @helayoty @johnbelamaric

I'm still working on the meat of the proposal and hope to have a draft of that ready to share by the middle of next week before I go on vacation through the end of the year.