Refactor faces_along_line() to return a FacesAlongLine object with more methods besides just iter()

[mkovaxx]

More queries as in:

• nearest_positive()
• farthest_positive()
• nearest_negative()
• farthest_negative()
• etc.

See comment here: https://github.com/bschwind/opencascade-rs/pull/147#discussion_r1390318849