Display delta time between normal marker and alt-marker

[mmehari]

Is your feature request related to a problem? Please describe.
Analyzing signal events usually requires knowing the time delta between the events. There are two markers already available (normal marker and alt-marker) and it is natural to calculate and display the delta between the two.

Describe the solution you'd like
On the top bar where normal marker time is displayed, a delta display can be added here. It would even be nice if it appears only when both markers are visible.

Describe alternatives you've considered

Additional context

[Lramseyer]

Delta time is displayed in the status bar on the bottom right of the VScode window. I can add units in Hz if that helps!

[mmehari]

Now I see it and indeed that will be helpful if the frequency is displayed as well.