[Health 13.1.4] Support for Workout/Exercise Routes

[wolru]

Is your feature request related to a problem? Please describe.
Currently, the flutter_health package supports fetching workout/fitness session data (e.g., HKWorkout on iOS, ExerciseSession on Android), but does not provide access to route/location data associated with those sessions.
This limits apps that want to show the user’s workout paths (running, cycling, walking, etc.) on a map.

Describe the solution you'd like

• IOS : HKWorkoutRoute
• Android : ExerciseRoute

Describe alternatives you've considered

• Directly using HealthKit/Health Connect native APIs, but this requires custom platform channels and defeats the purpose of using this unified package.
• Third-party GPS logging during workouts, which does not integrate with the user’s official health data.

Additional context

• Many fitness apps visualize the workout route on a map as part of their user experience.
• Adding support for HKWorkoutRoute and ExerciseRoute would greatly enhance the package’s usefulness for fitness-related applications.