Add Safari versions for SVGAnimatedLengthList API (#8604)
Add Safari versions for SVGAnimatedLengthList API (#8604)

This PR adds real values for Safari (Desktop and iOS/iPadOS) for the `SVGAnimatedLengthList` API, based upon manual testing.

Test Code Used: `http://mdn-bcd-collector.appspot.com/tests/api/SVGAnimatedLengthList`
mdn/browser-compat-data,chrisdavidmills/browser-compat-data,mdn/browser-compat-data,chrisdavidmills/browser-compat-data