Added greatCircleAngle function for sphere distance calculation in degrees

Why it matters

This feature provides a simple and precise method to compute the great-circle distance, which is the shortest distance over the earth's surface, enabling geographic and location-based calculations directly within ClickHouse queries.

How to use it

Use the greatCircleAngle function by providing latitude and longitude coordinates (in degrees) of two points. For example:

SELECT greatCircleAngle(lat1, lon1, lat2, lon2) FROM table

This will return the distance in degrees on the sphere between the two points.