Build

SftpClient: add IProgress to DownloadFileAsync and UploadFileAsync (#… #628

Job	Run time
Linux	8m 31s
Windows Integration Tests .NET	12m 44s
Windows Integration Tests .NET Framework	13m 3s
Windows	14m 53s
Publish GitHub Package	14s
Publish NuGet Package	0s
	49m 25s

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