Reattach units from MTK

[vchuravy]

Makie@0.24.7 (released a few days ago) comes with support for DynamicQuantities and axis conversion.

https://docs.makie.org/dev/explanations/dim-converts#Experimental-DynamicQuantities.jl-support
MakieOrg/Makie.jl#5280

This allows one to do something like

    simulation_end = 7us"day"
    tspan = (0, ustrip(1u"s", simulation_end))

    sol = ...
    
    fig = Figure()
    ax = Axis(fig[1, 1]; 
        dim1_conversion=Makie.DQConversion(oneunit(simulation_end), units_in_label = false),
        xlabel="Time ($(dimension(simulation_end)))"
    )
    # plot!(ax, sol) -- when units are reattached
    t = sol.t .* u"s"  # reattach units manually
    lines!(ax, t, sol.u ")

And get a nice, readable plot that has time axis units in days. Now my ModelingToolkit has

@independent_variables t [unit=u"s"]  # time

(as well as units for all other variables)

So it would be fantastic if units would be reattached either generally, or specifically for plotting in Makie.

x-ref: SciML/Catalyst.jl#1341