Implement scraping movies by URL

[woodgen]

It's the first time I really touched go or TypeScript, so a careful review is appreciated.

This series of patches implements the ability to scrape movies by URL.
It supports things like duration, studio and front + back image.
An example xpath scraper for Gamma Entertainment can be found on my community scrapers branch:
https://github.com/woodgen/CommunityScrapers/tree/movies

I tested the scraper with Evil Angel and it works well for creating new and updating existing movies by URL.

For more details I paste the commit messages here, since github will hide them:

    ui/movies: Add movie scrape dialog.
    
    Adds possibility to update existing movie entries with the URL scraper.
    
    For this the MovieScrapeDialog.tsx was implemented with Performers and
    Scenes as a reference. In addition DurationUtils needs to be called one
    time for converting seconds from the model to the string that is
    displayed in the component. This seemed the least intrusive to me as it
    kept a ScrapeResult<string> type compatible with ScrapedInputGroupRow.

    graphql+pkg+ui: Scrape movie studio.
    
    Extends and corrects the movie model for the ability to store and
    dereference studio IDs with received studio string from the scraper.
    This was done with Scenes as a reference. For simplicity the duplication
    of having `ScrapedMovieStudio` and `ScrapedSceneStudio` was kept, which
    should probably be refactored to be the same type in the model in the
    future.

    graphql+pkg+ui: Implement scraping movies by URL.
    
    This patch implements the missing required boilerplate for scraping
    movies by URL, using performers and scenes as a reference.
    
    Although this patch contains a big chunck of ground work for enabling
    scraping movies by fragment, the feature would require additional
    changes to be completely implemented and was not tested.

[WithoutPants]

Looks good. Thanks for the submission.