File preview feature for assets

[RFSH]

Adding "image_preview": true to asset annotation will display a preview of the selected image below the default presentation of the asset. We want to explore allowing preview for more types and on other apps in this issue. For example, we could have a PDF, JSON, or CSV viewer.

We should have a discussion to sketch how the annotation would look like in this case. Instead of a simple boolean, we should most probably have settings like the filesize limit given that we have to send secondary requests for this preview.

We should also list the exact types that we want to allow.