HyperTrack constructor Null safety

1. hypertrack_plugin
2. hypertrack
3. HyperTrack
4. HyperTrack constructor

HyperTrack class

1. Constructors
2. HyperTrack
3. Static properties
4. deviceId
5. errors
6. errorsSubscription
7. isAvailable
8. isAvailableSubscription
9. isTracking
10. isTrackingSubscription
11. location
12. locationSubscription
13. metadata
14. name
15. orders
16. ordersSubscription
17. workerHandle
18. Static methods
19. addGeotag
20. addGeotagDeprecated
21. addGeotagWithExpectedLocation
22. addGeotagWithExpectedLocationDeprecated
23. locate
24. setIsAvailable
25. setIsTracking
26. setMetadata
27. setName
28. setWorkerHandle