Process OEmbed data with url-metadata #82
Description
Add an input flag to indicate that url-metadata should look for OEmbed information for a given URL (this would be used for youtube/vimeo previews).
Add columns for the embed info to match the response from getVideoDataFromUrl & return it from the /tasks/url-metadata endpoint.
In the URL metadata task, upload any "image url" fields to S3 and store the resulting key.