Feature: Filter outings with a gpx track

[agneshelmstetter]

Community discussion about this feature (mandatory)
Link to https://forum.camptocamp.org/t/filtrer-les-sorties-avec-trace-gps/330626 where this feature has been validated

Is your feature request related to a problem? Please describe.
It's not always easy to find GPX tracks. Many routes and outings don't have GPX tracks.
It would allow to select tracks for different activities (ski/walk), to know when it was done, by who.
And to find variants for each route, or combinations of routes.

Describe the solution you'd like
Add a possibility to filter outings with gpx tracks in the "divers" menu.
Best, show tracks on the map.