add svg support

[vidhanio]

No description provided.

[Brocktho]

Would love to add interest to SVG support, looked at that PR mentioned and it does work out of the box no real issues. I saw you didn't like the feature flag and maybe wanted some more documentation surrounding those elements. I started going through and trying to make those fixes but while doing so I had a couple questions for your preference on it

[Brocktho]

Would you prefer that all SVG elements are added inside the elements! macro? or rather have them sidecar (in their own svg_elements!) like that pull request draft has? If putting them all into the elements! macro the svg global props are much more limited than most elements and would either want a refactor of many existing elements or to accept that about 20 attributes are "acceptable" for svg elements to have on them but not technically valid by spec.

While I was digging into this I also found a number of "GlobalAttributes" that aren't technically global based on the spec here: MDN Dev Docs. Would you like those to be refactored? Or I'm assuming some of these are custom element attributes for web components that I might not know of? (some examples: autofocus, enterkeyhint, is, itemid, etc.)

Curious what you'd prefer, I'd be fine to do any of the options (sidecar, add them to main elements without refactor, add them to main elements with larger refactor)