List all hunt approvals belonging to requesting user.

def ListHuntApprovals(context=None):
  """List all hunt approvals belonging to requesting user."""
  items = context.SendIteratorRequest("ListHuntApprovals",
                                      hunt_pb2.ApiListHuntApprovalsArgs())

  def MapHuntApproval(data):
    return HuntApproval(data=data, username=context.username, context=context)

  return utils.MapItemsIterator(MapHuntApproval, items)