feat: add support for waylines & waypoints in drone flight plans

[Pradip-p]

What does this PR do?

Adds support for waylines and waypoints in the create_waypoint function. Users can now toggle between waypoints and waylines.

• Introduced a mode parameter to toggle between waypoints and waylines.
• Default behavior remains unchanged (waylines mode).

screenshots

• with waypoints:
  

• with waylines:
  

[ivangayton]

@aadarshdhakal and @spwoodcock this would be great to have; is there a plan to get this merged and the corresponding UI change (switch to toggle between waypoints and waylines) into the Web app?

[nrjadkry]

This is indeed a useful feature @ivangayton , but this does not include using waylines for the terrain following.
However, I am merging this and will work on implementing the waylines for the terrain following as well .