Add new fields on professional space

[raphdom]

To enrich the experience, add new fields to curate the data like:

• image
• twitter link
• video

[madewild]

@raphdom in scope for this release in the end?

[madewild]

@Dgojsic can you provide the list of fields you would like to add?

[raphdom]

• Social media links should be one per social media: facebook, x, instagram, youtube, one per each, in the "project info"
• Change the current social media to share the page to a dropdown button "Share on"
• For the image, it is only one link for the image

[svili]

The new properties are available on the editor backend for ingestion:
image_url, image_description, image_copyright, youtube_video_id, twitter_username, facebook_user_id, instagram_username.
Two notes:

• The image_url, description and copyright must be edited together. Meaning you must fill out all 3 or they must be null, in a special case image_url can be "".
• Generally, from now, if the backend receives "" (empty string) for a given field, it will delete that field from the wikibase. Meaning if the user wants to delete a twitter_username, you can send the backend empty string. Null means the same, no change.