Safe SVG is remote fetching images from S3

[joehoyle]

The Safe SVG plugin is remote fetching data in https://github.com/10up/safe-svg/blob/develop/safe-svg.php#L290. This is called via wp_get_attachment_image_src() which happens a lot of the time. On many page loads that then include SVGs this will slow down the page load a lot.

This is to set the image dimensions from things like viewBox or width / height attributes. I think we need to remove that behavior, but there's no simple way to unhook this, as it's part of a self initialized class with no global handle.

[joehoyle]

Looks like this might be also tracks in 10up/safe-svg#75