multipart: Respect disable-sha256-payload on upload

[klauspost]

When preparing, forward the --disable-sha256-payload parameter.

Requires minio/minio-go#1988

Fixes #329

Testing

Without --disable-sha256-payload on non TLS host:

127.0.0.1:9001 [REQUEST s3.PutObjectPart] [2024-08-05T11:38:38.387] [Client IP: 127.0.0.1]
127.0.0.1:9001 PUT /warp-benchmark-bucket/warp-multipart.bin?partNumber=8&uploadId=YTQ0NDc3MTktNWViMS00YWY4LWI0NmMtYTgyMjMyYzE5YjAyLjlhNjU3OWVlLWY3ODctNGZhMi1hMTBmLTkyNDIwOWU0NDMxZngxNzIyODUwNzE4MzcxOTA1MjAw
127.0.0.1:9001 Proto: HTTP/1.1
127.0.0.1:9001 Host: 127.0.0.1:9001
127.0.0.1:9001 User-Agent: MinIO (windows; amd64) minio-go/v7.0.75 warp/(dev)
127.0.0.1:9001 X-Amz-Content-Sha256: STREAMING-AWS4-HMAC-SHA256-PAYLOAD
127.0.0.1:9001 X-Amz-Date: 20240805T093838Z
127.0.0.1:9001 X-Amz-Decoded-Content-Length: 5242880
127.0.0.1:9001 Authorization: AWS4-HMAC-SHA256 Credential=minio/20240805/us-east-1/s3/aws4_request,SignedHeaders=host;x-amz-content-sha256;x-amz-date;x-amz-decoded-content-length,Signature=75c66253396134912f0ba16503254c07c3485fc89d4c08c14be16f4d20742071
127.0.0.1:9001 Content-Length: 5250166
127.0.0.1:9001 <BLOB>
127.0.0.1:9001 [RESPONSE] [2024-08-05T11:38:38.500] [ Duration 112.643ms TTFB 0s ↑ 5.0 MiB  ↓ 0 B ]
127.0.0.1:9001 200 OK

With --disable-sha256-payload on non TLS host:

127.0.0.1:9001 [REQUEST s3.PutObjectPart] [2024-08-05T11:40:02.698] [Client IP: 127.0.0.1]
127.0.0.1:9001 PUT /warp-benchmark-bucket/warp-multipart.bin?partNumber=6&uploadId=YTQ0NDc3MTktNWViMS00YWY4LWI0NmMtYTgyMjMyYzE5YjAyLmJlZGNjZjc2LWJjZWEtNDBhOC05YmU3LTE5YjFiYThhNTRjNHgxNzIyODUwODAyNjgyNzk2OTAw
127.0.0.1:9001 Proto: HTTP/1.1
127.0.0.1:9001 Host: 127.0.0.1:9001
127.0.0.1:9001 X-Amz-Content-Sha256: UNSIGNED-PAYLOAD
127.0.0.1:9001 X-Amz-Date: 20240805T094002Z
127.0.0.1:9001 Authorization: AWS4-HMAC-SHA256 Credential=minio/20240805/us-east-1/s3/aws4_request, SignedHeaders=host;x-amz-content-sha256;x-amz-date, Signature=378eeccc3e2e530193ebe31015aa1b58cd47f57bc611064051c50e768c8ca949
127.0.0.1:9001 Content-Length: 5242880
127.0.0.1:9001 User-Agent: MinIO (windows; amd64) minio-go/v7.0.75 warp/(dev)
127.0.0.1:9001 <BLOB>
127.0.0.1:9001 [RESPONSE] [2024-08-05T11:40:02.787] [ Duration 88.98ms TTFB 0s ↑ 5.0 MiB  ↓ 0 B ]
127.0.0.1:9001 200 OK