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

[gaul]

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.

Information Checklist
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[joshfree]

Hi @gaul thanks for reaching out to us via this GitHub issue. Someone from the Azure Storage team will follow up

[gaul]

Are put blob and put block basically the same? Does BlobOutputStream just need to add comp=block&blockid=id HTTP parameters to do what I want?

[gaul]

@joshfree Any suggestions on who I should follow up with?