Add Cloudflare as an option for Images::Optimizer

Is this feature related to a problem? Please describe.

We currently offer two options for image auto-cropping, optimization, and CDN caching: Cloudinary and Imgproxy.

Cloudinary is the cloud option and Imgproxy is the variation which can be containerized as part of the Forem's stack.

Adding Cloudflare Image Resizing service would be a good additional option because:

Cloudflare is already part of how we instruct Forems to manage DNS, and how we manage DNS for DEV.
Cloudflare image resizing offers the simple cropping functionality that we get from Cloudinary
Cloudflare is cheaper and more performant than Cloudinary in general. There are certain feature tradeoffs, but generally it is a good option to provide alongside Cloudinary.

We could consider migration to Cloudflare for DEV, but would not want to do that hastily. Adding Cloudflare as an option in the Forem stack could provide some experimentation which would better inform a possible migration in the future.

Describe the solution you’d like

Add Cloudflare as a third option to Images::Optimizer, which is turned on with the proper environment variable.

We should not seek to turn this on for DEV any time soon. This is strictly enabling a different option between Cloudinary and Imgproxy. This could inform a proof of concept for a possible DEV migration.

Definition of Done

[ ] Cloudflare added as option for Images::Optimizer
[ ] ENV var is made available to enable this option.

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