Show elevation gain in aggregated statistics

[DavidHenryThoreau]

Is your feature request related to a problem? Please describe.
At the moment workouts are display like this picture :
https://raw.githubusercontent.com/OpenTracksApp/OpenTracks/main/fastlane/metadata/android/en-US/images/phoneScreenshots/screenshot5.png

Describe the solution you'd like
I would like to add elevation gain.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.

[dennisguse]

Similar to #937

[dennisguse]

@DavidHenryThoreau why actually?

[DavidHenryThoreau]

Because I can't see elevation.