Add infinite scroll pagination to user gallery

[vnugent]

What would you like to be able to do? Please describe.
As a user when I look at a profile with a lot of photos, I want to be able keep scrolling to see more.

While working on #869 I see the need for pagination support to improve data liveliness in edit mode. When a user uploads & tags photo, we need to update the backend and at the time maintain a local cache of the tags. Pagination support enables the frontend to fetch just a small chunk of media + tags at a time.

FYI we're currently doing "fake" pagination. We fetch the most recent 500 photos and keep adding 20 more to the gallery as a user scrolls.

Related issue #869

How important is this to you (Please pick one)

• Important