Allow RESTClient and GQLClient to support automatic pagination

[samcoe]

Pagination is currently not possible using RESTClient and takes lots of manual work using GQLClient. We should support this feature for both. Initial implementation idea is to add a pagination options to ClientOptions which would enable this for both clients and be a noop for the HTTPClient.

[heaths]

Similar to cli/cli#1268. Perhaps there's a common solution for both. What @mislav suggested is a good idea. I would think with REST an array could simply be amended with subsequent elements. GraphQL might be more tricky.