User ordering after clicking "Load more" jumps around

[chapmanio]

Rework user search to query against DynamoDB table instead of Cognito so that we can control the order of results coming back.

We should also consider how paging should work here:

• Should we page on the API or just in the UI (what's the performance impact of having no paging if we have a large set of users).
• Should we use token based paging or offset based paging (first is better for consistency, second is better for usability).

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Original Issue

Currently when "Load more" is clicked, additional data is retrieved and the client will automatically sort this based on the existing sort and direction selections. This may be jarring for the user and cause a "jump" in the display.

A potential solution may be around creating the user in the DB along with Cognito - although this needs further investigation!