Visualization: add option to scale data

[dweindl]

Which problem would you like to address? Please describe.

It would be convenient if there was an option to scale data before plotting. E.g. the time unit in the model might be seconds, but one might want to have hours on the x-axis for plotting.

Describe the solution you would like

One could add an additional field to provide a coefficient for scaling the data. Not sure how to name it. {x,y}Scale are already used for a different purpose.

Not sure how relevant this would be beyound unit conversion. So in case #500 would be addtessed, one could also implement this in terms of providing a unit for the respective axes.

Describe alternatives you have considered

Not using the PEtab visualization table, but creating plots manually.