Add CanvasGradientRenderer and update Canvas component to support gradient rendering #14
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Creates a brand new CanvasGradientRenderer. It adheres to the Renderer interface defined in
renderer.tsand is a mostly drop in replacement for theCanvasAsciiRendererfor orbweaver users. The renderer allows users to pass an array of colors (defined as hex, rgba, or hsl) and a gradient is rendered across this color band. An example inpackages/webis created in a new route/gradient.