AttachmentBytesResource_* to take the (complex obs) view as parameter

1. Description

AttachmentBytesResource just lets the complex obs view to default to an uncontrolled value. However generally speaking it should provide a way to specify which complex obs view is being requested.

2. Dev Notes

See here in AttachmentBytesResource how null is always used:

viewHelper.getView(obs, null)

For info/ref., here in AttachmentsConstants are the default "original" and "thumbnail" view names that are introduced through the Attachments module API layer.

3. Acceptance Criteria

As a REST API consumer I want to be able to calls such as:

/rest/v1/attachment/{uuid}/bytes?view=complexdata.view.original