[FEATURE REQ] stageBlock should support InputStream without mark/reset support

**Is your feature request related to a problem? Please describe.**
I am adding Azure SDK support to S3Proxy. I am trying to implement S3 upload part and translate it into Azure SDK. gaul/s3proxy#708

**Describe the solution you'd like**
I would like a stageBlockFromOutputStream method which returns an OutputStream to stage a block with. This would be similar to the existing non-multipart upload methods.

**Describe alternatives you've considered**
I considered using stageBlock with a BufferedInputStream but this could lead to large memory use.

**Additional context**
Add any other context or screenshots about the feature request here.

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