[FR] Files: store locally for quick access (even offline) to view or edit them

### Description

I wish to have files to be cached locally so I can access them quickly and even edit them with external app and so after saving them, Appflowy will update original file locally as also on the server. Also this way, I will be able to access the files even if I am offline.
Here an example of a local PDF file, that I click and immediately open with my external app for PDF files -- that was a copy of a note page from Joplin, that stores the files locally as I wish for Appflowy:


### Impact

All users that uses file blocks.

### Additional Context

_No response_