Create a multipart upload for translation

This endpoint is designed for files larger than 30mb using the multipart upload endpoint. This endpoint will return several pre-signed URLs based on the parts of the file. Parts are the number of 5mb chunks in the total file size. This endpoint supports files up to 5TB.

Once the multipart endpoint has been completed the /v2/sign-requests/video-translation/multipart/complete endpoint needs to be called. This endpoint will ensure that the parts of the file are merged back together into an editable format.