Add proposal for CiliumEndpointSlice stabilization

[thorn3r]

Add CFP design proposal for graduation CiliumEndpointSlice to 'stable'.

cilium/cilium#31904

[xmulligan]

@thorn3r we now have different statuses for CFPs. Where do you think this one currently falls? https://github.com/cilium/design-cfps#status

[thorn3r]

@thorn3r we now have different statuses for CFPs. Where do you think this one currently falls? https://github.com/cilium/design-cfps#status

Sorry I missed this comment. I think it would fall into 2 Implementable, although we don't have the explicit approval of a committer, (the team/sig-scalability agreed to the contents). I've had to pivot from this work for now, so it's possible the scope could change in the future when we're able to pick it back up.

[xmulligan]

Suggested change

	**Cilium Release:** 1.16
	**Cilium Release:** 1.16
	**Status:** Implementable

[bowei]

cc: @dlapcevic

[joestringer]

Marking as draft for now. Feel free to mark it as "Ready for Review" if we have a contributor interested to work on this. I would suggest syncing with #sig-scalability on Cilium Slack to coordinate efforts on this and move the CFP towards approval.