Can you expose a part="svg" for the SVG content

When using it with custom icons : ``
Because of the Shadow DOM we can't style at all the content of the SVG. Any custom SVG used is always a square because of the this css lines :
https://github.com/ionic-team/ionicons/blob/8c2a507fcff2cb5f2edff60357ffd7feb70bb987/src/components/icon/icon.css#L27-L34
By adding a `part="svg"` it would be possible to have more flexibility to style the SVG from the outside. In my case setting height to auto, but it could be to change the color of a specific path or anything else.

Start with src/components/icon/icon.css lines 27-34 and the icon component rendering used by . Confirm how the custom SVG is inserted, then expose the SVG with part="svg" so callers can style it from outside the Shadow DOM. Done means external styling can target the SVG, including changing its sizing behavior.

Written by the indexing model from the issue text.