Add HubController Download/Upload alternatives for no user intervention

[jpopeneng]

Prerequisites

• I have written a descriptive issue title
• I have verified that I am using the latest version of the DEHP-Common
• I have searched open and closed issues to ensure it has not already been reported

Description

In the DST STEP-AP252 context it is required to upload/download files from a DomainFileStore without the manual selection of the file path from the user.

The current implementation HubController.Download() calls fileDialogService.GetSaveFileDialog(), requiring used intervention.

Actions

Add HubController Download() and Upload() methods Returning/Using a FileStream. Thus Read/Write will be performed externally according to user needs.