[Feature] Add multiple urls to be returned by scrapers.

[Tweeticoats]

Is your feature request related to a problem? Please describe.
Scrapers only support a single url to be returned by scene or performer scrapers.
It would be useful to add URLS as a list of strings returned by the scraper.
Some sites wikidata can potentially reference a whole lot of other databases and potentially provide urls to other databases that may be useful. One database may know about another database so running scrapers would be useful to expand the information that stash knows about.

Describe the solution you'd like
The Scene, Performer, Gallery objects currently have a URL field that a scraper can return a single string
It would be useful to add URLS as a list of strings returned by the scraper containing a list of urls.