(timebox) Enable Direct Edit on another binary than file:content

As required by some customers, we want to explore the feasibility of direct editing attachments or other custom binary holders
The questions to answer with this ticket are :

• What are the requirement for the url UI-side for the download to occur
• How to enable upload of edits / pass xpath of blob ...
• Create remaining Jira tickets and estimate related effort

Note : suggestion of using `Blob.AttachOnDocument` instead of `NuxeoDrive.AttachBlob`