[core] feat(Icon): new prop 'svgProps'

[bvandercar-vt]

Fixes #0000

Checklist

• Includes tests
• Update documentation

Changes proposed in this pull request:

allow passing of props to SVG element in the Icon.

Reviewers should focus on:

Example usage:

We are using an Icon as the target of a Tooltip2. So, we cannot use the title prop of the Icon, as this creates 2 visible tooltips when hovered (the title html tooltip, and the Tooltip2 content). However, we still need the SVG to have an accessible label, so we want to be able to pass the aria-label prop to it (as opposed to a title). With this, will also override to set aria-hidden=false (as was given by #5955)