[flutter_tools] support toggling CanvasKit rendering on with 'k' #52511
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Description
Adds the ability to toggle a debug build of Flutter for the Web between the html and CanvasKit backends with "k". Requires a slightly newer engine revision (soon).
Currently this is done as a full page refresh. Its not clear if we could use the hot restart functionality to invalidate the dart sdk, since the dart sdk itself tracks state for hot restarts.