Add a `DataCanvas`

[rafaqz]

I just plotted a data timeline in an otherwise interactive simulation plot, and... it would be very nice to be able to change the data as well as simulation parameters.

MakieDraw.jl could do this pretty easily. We need the time or whatever independent variable X is being plotted, and the dependent variable Y to edit interactively.

We would convert these to Points and use the code from GeometryCanvas{Point} or GeometryCanvas{LineString} and just write the Y values back to the dependent data vector.