[PATCH 1/2] sftp-server: support copy-data request

[Mike Frysinger]

> Add support to the sftp-server for the copy-data extension defined in
> [1].  This provides for efficient copying on the server side otherwise
> clients have to emulate it by downloading the file before uploading it
> to the new path.  For large files or slow networks, this can be
> prohibitively slow. Now doing a file copy is limited only by the server
> I/O.
> 
> For clients that provide virtual file systems on top of SFTP, this can
> provide significant performance gains.
> 
> [1] https://tools.ietf.org/html/draft-ietf-secsh-filexfer-extensions-00#section-7

any feedback on this one ?  it's been kickin around for a few years now :x.
the set i posted in Dec 2021 should still apply cleanly to latest master.
-mike
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