ENG-651: Add pagination section

[calummoore]

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[linear]

ENG-651 Use a class for CollectionListResponse

This enables a better experience around pagination queries. User could write something like:

const res = await db.collection('hello').get()
const next = await res.next(); // gets the next set of collections

• Refactor transformation of list values
• Add .next() and previous() cursor methods
• Update docs