In cases where we can, we should give the user a clear understanding of what is causing the error i.e., we should add specific error cases where possible and sensible.

Currently users receive a 500 Unexpected error when they send an edit that exceeds the item size limit

Acceptance criteria:

• The response status code should be 400
• Error message to be of the form

{
  "code": "Entity-too-large",
  "message": "Entity size exceeds 20KB."
}