enhancement: Support new QueryOpts & Evaluations filter settings

[DerekStrickland]

Once this PR lands, Evaluations will be the first API to support pagination and filtering options.

We'll need to:

• Update the QueryOpts struct to support LastToken and deprecate NextToken.
• Update the setQueryOpts framework method and associated tests to manage the new parameter and warn on use of the deprecated parameter (possibly a new X-Deprecation-Warning header or something similar - need to design)
• Update the Evaluations generator code to include new supported query parameters
• Update the set of default query options in the generator code
• Regenerate clients

[tgross]

@DerekStrickland in lieu of future work to automate this all, let's update the contributing guide checklist to make sure changes to the API get followed-up here as well.

[DerekStrickland]

Done