Get presigned URLs for multipart upload parts

curl --request POST \
  --url https://api.case.dev/vault/{id}/multipart/part-urls \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "objectId": "<string>",
  "uploadId": "<string>",
  "parts": [
    {
      "partNumber": 2,
      "sizeBytes": 2684354560
    }
  ]
}
'

{
  "urls": [
    {
      "partNumber": 123,
      "url": "<string>"
    }
  ]
}