Adapt InternalUploadFile for async #1653
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The recently added UploadFileAsync effectively calls stream.CopyToAsync(SftpFileStream). This is slower than the sync UploadFile (by about 4x in a local test) because the sync version sends multiple write requests concurrently, without waiting for each response in turn like the stream-based version does. This change adapts the sync code for async and uses it to bring the performance of UploadFileAsync in line with that of UploadFile.
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The recently added UploadFileAsync effectively calls stream.CopyToAsync(SftpFileStream). This is slower than the sync UploadFile (by about 4x in a local test) because the sync version sends multiple write requests concurrently, without waiting for each response in turn like the stream-based version does.
This change adapts the sync code for async and uses it to bring the performance of UploadFileAsync in line with that of UploadFile.