Multiple time tracker

[RobinMaub]

Problem description

Having a curve, I'd like to see the values on different time points.

Answer these questions (or I will ignore your issue)

1. Describe your platform / Operative System and the version of PlotJuggler you are using: Windows 10 & 11, plotJuggler 3.9.0
2. Compile and try the latest version in the main branch and check if the problem persists: same thing
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, reproducible
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.