sort-by fields for paginated List RPCs

[tgross]

The paginator introduced in #11648 allows API calls to get smaller subsets of the data. But without the ability to sort the API by a particular field, these values are always returned in the order of ID (the same as they are found in the state store). For APIs like Deployment.List and Eval.List, this isn't the most useful ordering. The command line or UI can sort unpaged responses by arbitrary fields of course, but for paged responses this behavior is less desirable.

cc @ChaiWithJai as a heads up

[github-actions]

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