image and svg support for canvas

[hecrj]

This PR introduces image and svg support for the canvas widget.

Raster images can be drawn with the Frame::draw_image method, while vector images can be drawn with the Frame::draw_svg method. These new methods take a canvas::Image and a canvas::Svg, respectively.

The solar_system example has been updated to showcase this new feature:

2024-08-04.04-57-09.mp4