Share attachments/messages as they are ("forward") instead of "sharing"

### Your use case

#### What would you like to do?
I received a file attachment, "shared" it, and now EA is processing it and also sending it as a video file.

I would rather forward the attachment as-is.

#### Why would you like to do it?
- skip re-encoding/compressing, as the original sender probably did that already
- keep the same attachment type and other (-> extensible events?) meta info such as text descriptions.

#### How would you like to achieve it?
Like web #parity

### Have you considered any alternatives?

Sadly, this would add more UI. Can Element catch cases where things are "shared" to itself and then apply "forwarding" rather than "sharing" automatically?

### Additional context

#2967

### Are you willing to provide a PR?

No