TMSS-259: Add tests for angular separation endpoint. Improve speed on sunrise endpoint by reducing precision.

TMSS-459: Add new endpoint 'angular_separation_from_bodies' and backend logic to calculate distance of a pointing from solar system bodies

TMSS-435: Return json object with sunrise, sunset, day and night times at sun_rise_and_set call, handle multiple stations and timestamps provided as parameters

(cherry picked from commit 3bec3e06)