[feature request] SVGTiny12 support.

Add flag restricting svg output only to the static features of the SVGTiny12 profile:
https://www.w3.org/Graphics/SVG/feature/1.2/#SVG-static

Rationale: The Qt SVG module supports only the static features of SVG 1.2 Tiny:
https://doc.qt.io/qt-6/svgextensions.html

Currently, visualizing D2-generated SVG files in Qt is not possible without additional sanitization steps.