feat: Image mark

[techniq]

• [ ] Support svg, canvas, and html layers
• [ ] Use as data marks
  • https://observablehq.com/plot/marks/image
  • use with Marker
  • https://observablehq.com/@observablehq/plot-image-medals
  • https://observablehq.com/@observablehq/plot-image-scatterplot
• [ ] Use for TileImage

See discussion. Add a new Image mark that works for both SVG and Canavs would be nice to add first.