[FR] Changing frame and tick thickness in GR

[Boxylmer]

I've read (on a couple other forums) requesting this feature on at least GR. The same can be achieved in PyPlot, as many of these posts have pointed out, but for my use case the PyPlot backend is just too slow for a constantly updating graph on a GUI. GR is quite fast in comparison and well into the acceptable range of latency for my project.

Feel free to close if there's another issue on the Plots.jl github page, but I didn't see a formal request for one with this reasoning for specifically frame and tick widths.

Relevant discourse and forum posts also requesting this feature:

• https://discourse.julialang.org/t/plots-jl-modify-frame-thickness/24258 (hacky workarounds that don't help if you need to avoid PyPlot)
• https://github.com/JuliaPlots/Plots.jl/issues/1099 (opened in 2017, multiple use cases but doesn't point out tick thickness as well)
• https://stackoverflow.com/questions/70133581/how-do-i-make-x-and-y-axes-thicker-with-plots-julia (Thickness_scaling workaround, causes other visual issues such as massive whitespace)
• https://discourse.julialang.org/t/tick-size-in-plots-jl/74793 (also thickness scaling workaround)

There is clearly a need for this feature that spans from years ago to fairly recent posts.