Support CSS d property for SVG

[Bramus]

Currently implemented in Blink/Chromium and soon to be shipped with Gecko/Firefox.

Relevant links:

- SVG Presentation Attributes: https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/Presentation
- Gecko Intent to Ship: https://groups.google.com/a/mozilla.org/g/dev-platform/c/0hj7fhc2ZGc/m/c3oKiaQ3CwAJ
- Gecko Tracking Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1744599
- WPT Dashboard: https://wpt.fyi/results/svg/path/property?label=experimental&label=master&aligned
- Demo: https://www.bram.us/2017/06/21/changing-svg-path-data-with-css/

[Radar WebKit Bug Importer]

<rdar://problem/86713232>

[Karl Dubost]

These are tested in https://wpt.fyi/results/svg/path/property?label=experimental&label=master&aligned

WebKit scores 0/235

[Karl Dubost]

*** Bug 272219 has been marked as a duplicate of this bug. ***

[Karl Dubost]

Another failure found by Antoine in Bug 272219
https://wpt.fyi/results/web-animations/responsive/d.html

[Antoine Quint]

The last blocking bug has landed, this is complete as of 277455@main.

[Antoine Quint]

Some of the blockers got re-opened due to a Speedometer regression, so this is reopened as well.