KEP 6089: Workload Aware Scheduling Controller APIs (#6092)

* Initial draft of KEP 6089: Workload Aware Scheduling Controller APIs

* KEP 6089: Address technical TODOs, design principles, and alternatives

* KEP-6089: Address first round of review comments

* KEP-6089: Introduce per-level types

* KEP-6089: add helayoty@ as an author

Signed-off-by: Heba Elayoty <heelayot@microsoft.com>

* KEP-6089: Address second round of review comments

* Update PRR

Signed-off-by: Heba Elayoty <heelayot@microsoft.com>

* Update Job integration section

Signed-off-by: Heba Elayoty <heelayot@microsoft.com>

* Add validation for new features section

Signed-off-by: Heba Elayoty <heelayot@microsoft.com>

* Update non-goals

Signed-off-by: Heba Elayoty <heelayot@microsoft.com>

* Remove duplicate sections with job integration

Signed-off-by: Heba Elayoty <heelayot@microsoft.com>

* Address feedback

Signed-off-by: Heba Elayoty <heelayot@microsoft.com>

* update DV

Signed-off-by: Heba Elayoty <heelayot@microsoft.com>

* remove code snippet

Signed-off-by: Heba Elayoty <heelayot@microsoft.com>

* Add back the Job API changes

Signed-off-by: helayoty <heelayot@microsoft.com>

* Remove DV and new FG

Signed-off-by: helayoty <heelayot@microsoft.com>

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Signed-off-by: Heba Elayoty <heelayot@microsoft.com>
Signed-off-by: helayoty <heelayot@microsoft.com>
Co-authored-by: Heba Elayoty <heelayot@microsoft.com>