Allow image media types to use instagram feed

Problem/Motivation

I want the option to store the image from an instagram post in a media entity and display it with image styles, instead of storing the permalink and displaying an instagram post embed.

Proposed resolution

Allow media types with an image source field to be used for an instagram feed in addition to media types with an instagram source field.

User interface changes

Include image media types in field mapping options, and autofill the source field mapping based on what type of field it is, rather than always autofilling "permalink."

API changes

When importing content on cron, download the image from the media_url endpoint to drupal as a managed file entity. Then, give the file ID to the media entity to reference.