Get story points breakdown for a sprint

Returns the total story points and remaining points history for a sprint. The response includes snapshots at the sprint start date, sprint end date (if in the past), and any date where remaining points changed due to story completion. No snapshots are returned for dates after the sprint end date. If the sprint is ongoing and the projected completion date based on the burn-down trendline's zero intersection is at least one day after the sprint end date, itemsToPush contains backlog items that may not be completed. If the sprint is ongoing and the burndown trendline projects all work to be completed at least one day before the sprint end date, itemsToPull contains backlog items from the next sprint's TODO that could be pulled in. If there is no next sprint, itemsToPull will contain unscheduled TODO items from the team.