Add shift defects

Add defective units of a SKU to the shift that machine `machineId` was running at `time`, including shifts that have already ended. Use it when you know the machine and roughly when the defects were found, but not the shift id. **How defects add up.** Unlike operators, defects have no timeline and no order. Each call adds a new defects production log of `quantity` units of the SKU, covering the whole shift, and the shift's Quality and OEE count it in the background. Calls never replace earlier ones: * Sending `quantity: 2` and then `quantity: 3` records 5 defects. * Sending the same request twice records the defects twice, so retry only requests that failed. * To undo a call, delete the log it returned with `DELETE /v1/production-logs/{id}`. To see what a shift already has, list its logs with `POST /v1/production-logs/filters`. Defects are not attributed to any operator, and they can be added to past shifts, including ones whose production was reviewed. The SKU is given by `id` or by `name`; an unknown name creates a new SKU, so check the spelling. Errors: * `400`: no shift matches, the shift has not started yet, or the shift does not have enough production of that SKU to hold the defects. * `404`: `sku.id` is not one of your SKUs.