[13.x] Add license and workflow to illuminate/image

[jackbayliss]

Since we can access it via https://github.com/illuminate/image

This PR ensures the license.md, workflow, and .gitattributes are inline with all the other illuminate bits.

Also, while I was here, noticed the composer.json had no suggestion for ext-fileinfo, which is used

framework/src/Illuminate/Image/Drivers/InterventionDriver.php

Line 79 in 89d5f0a

$mimeType = (new finfo(FILEINFO_MIME_TYPE))->buffer($contents);

(afaik both drivers use process, but i went with suggest to mirror filesystem)

I spend a few hours every day just going through stuff and super old prs, just out of curiosity, so, hell yea and sorry

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