Added Media and Files APIs to API key allowlist

refs https://github.com/TryGhost/Toolbox/issues/219

- These two APIs similarly to Images API should be accessible by the Admin-API SDK. Opens up a way to write custom scripts uploading files and media

core/server/web/api/canary/admin/middleware.js

@@ -31,6 +31,8 @@ const notImplemented = function (req, res, next) {
         members: ['GET', 'PUT', 'DELETE', 'POST'],
         config: ['GET'],
         schedules: ['PUT'],
+        files: ['POST'],
+        media: ['POST'],
         db: ['POST']
     };