GCS to S3 translation issues

Resumable uploads

Most GCS clients will adopt the "Resumable upload" method as default for file upload, and will follow the stablished upload protocol.

However, in AWS S3 there is not such concept as "Resumable upload", so if our destination bucket belongs to AWS S3, the only way the Flashback node has to translate GCS's protocol is to emulate it using S3 multipart upload sessions.