Make ipycanvas blocks

Create custom blocks that use functionalities from `ipycanvas`.

`ipycanvas` is a lightweight, fast and stable library exposing the browser's Canvas API to IPython. It allows you to draw simple primitives directly from Python like text, lines, polygons, arcs, images etc. You can read more about it [here](https://ipycanvas.readthedocs.io/en/latest/). 
