Pagination version of 'all' for archivists

[arietrouw]

Should it be a batch helper in the Archivist wrapper?
A new .stream method?

[JoelBCarter]

This needs to be further decomposed into:

• The architecture (how we'll implement it on the Archivist Interface/Module)
• The implementation by the specific Archivist instances (MongoDB, IndexedDB, Memory, etc.)
• Utilization by consumers (diviners, likely a completely different & ongoing epic)