KEP-4222: Add streaming list encode requirement to CBOR KEP.

[benluddy]

• One-line PR description: Adds streaming list encoding as a CBOR beta requirement.

• Issue link: https://kep.k8s.io/4222

• Other comments: https://kep.k8s.io/5116 excludes CBOR, but the problem and requirement are effectively the same. We can solve this either with a special case (as has been done for JSON) or by the introduction of generalized streamed encoding to the upstream library.

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[benluddy]

/cc @deads2k @jpbetz

[lmktfy]

Suggested change

	- List object encoding supports "true" streaming (i.e. buffer size is not proportional to output
	- Collection (list response) encoding supports "true" streaming (i.e. buffer size is not proportional to output

The response to a list is, AIUI, a collection. And yes, collections have API kinds like PodList. We didn't line up our jargon before the v1 release.