Compute angle between a vector and a plane perpendicular to the image plane

[sfmig]

Is your feature request related to a problem? Please describe.
In a 2D, top view camera case, a user may want to compute the angle between a vector (e.g. the head vector) and a line that represents a plane perpendicular to the image plane (e.g., the walls of an enclosure).

In that case we would need to compute the angle between the (head) vector and the normal to the (wall) plane.

Additional context
This could be useful for boundary vector cells analyses, alongside #368