Function flyGeospatialCameraToAsync

Smoothly animate a GeospatialCamera to new yaw/pitch/radius/centre over durationMs, driven by the scene's render loop. Yaw takes the shortest angular path; the centre follows a great-circle (with an optional parabolic hop).

The returned promise resolves when the flight completes; it also resolves early if the flight is interrupted (by user input through attachGeospatialControls, or by a subsequent flyGeospatialCameraToAsync call). Only one flight runs at a time.