Allow plotted line width to be set

[Quick-Flash]

Problem description

I would like a way to control the width of the lines being plotted. Quite often I would like to have a line that is say twice as wide as the default lines plotted. Adding a setting to make allow the line width to be modified would be great.

Answer these questions (or I will ignore your issue)

1. Describe your platform / Operative System and the version of PlotJuggler you are using.
   Windows 11, 3.9.1
2. Compile and try the latest version in the main branch and check if the problem persists.
   Yes
3. Check if the problem can be reproduced using the dummy data created by the command line argument "-t" or one of the files in the folder "datasamples".
   Yes it can
4. If it can't be reproduced with the dummy data, please share the CSV file or the rosbag that can be used to reproduce the problem.
   N/A