message: [DataFactory] add an option for SFTP to support direct upload
diff: "operationTimeout": {
  "description": "Specifies the timeout for writing each chunk to SFTP server. Default value: 01:00:00 (one hour). Type: string (or Expression with resultType string).",
  "type": "object"
  + },
  + "useTempFileRename": {
  + "description": "Upload to temporary file(s) and rename. Disable this option if your SFTP server doesn't support rename operation. Type: boolean (or Expression with resultType boolean).",
  + "type": "object"
  }
  }
  },
  