Add support for GD

This would require the patch from ✨ Let GDToolkit support AVIF image format Needs work in order to work.

The quality setting seems to have no effect. If I set it to 1, 60 or 90 I get the same result.

Added a new MR that includes 📌 Test coverage Needs review so we can test this. It will fail until ✨ Let GDToolkit support AVIF image format Needs work is in, but we could see if we can apply a patch in the meantime.

I think this is good to go in as it is without waiting for core. If the core toolkit does not support avif then we'll get the "Your image toolkit gd doesn't support AVIF format" message in the logs. I've opened 📌 Prevent selection of unsupported toolkits Active to prevent it being selected when it's not supported.

I think the image quality issue should be addressed separately. We are passing the quality as a parameter to \Drupal\system\Plugin\ImageToolkit\Operation\gd\Convert::execute but GdToolkit ignores it.

This change is supported at a functional level. But I don't think we should merge it until the bug in core is fixed... or 📌 Prevent selection of unsupported toolkits Active is implemented and merged and we can detect that you have the required patch.

For ease of finding, core patch listed above is ✨ Let GDToolkit support AVIF image format Needs work