Implement ratio check for SVG images. Checking SGV size is not relevant as a SVG image can be enlarged without loss, but ratio can be important to check.

Currently, the validator add a violation withSIZE_NOT_DETECTED_ERROR in case of SVG image.

SVG size is guessed from viewbox, width and height attributes. Viewbox will provides default size, width and height can override viewbox size if they are number. Width and height as percentage are ignored as the final size will depend on the container.

I usepreg_match instead of\DomDocument orsimplexml functions to extract viewBox, width and height in order to avoid new dependencies onext-dom orext-simplexml.

In case of SVG,minWidth,maxWidth,minHeight,maxHeight,minPixels andmaxPixels are ignored because not relevant. OnlymaxRatio,minRatio,allowSquare,allowLandscape andallowPortrait can generate violations, like suggested in the comments of the abandoned#45486.