[Feature Request] Add angle and signed angle?

The greetings.

I have forked this master-branch and from this master-branch I have edited math.cs of which you can see here:

https://github.com/quakeulf/Unity.Mathematics/blob/master/src/Unity.Mathematics/math.cs

Specificially from line 98 to line 111 are my additions. I am also including them below this text so you can see in this field of text what I have proposed to add, but cannot, since I cannot seem to figure out how to do a request for pull:

        /// <summary>Returns the angle in degrees from 0 to 180 between two float3s.</summary>
        public static float angle(float3 from, float3 to)
        {
            return math.degrees(math.acos(math.dot(math.normalize(from), math.normalize(to))));
        }
        
        /// <summary>Returns the signed angle in degrees from 180 to -180 between two float3s.</summary>
        public static float anglesigned(float3 from, float3 to)
        {
            float angle = math.acos(math.dot(math.normalize(from), math.normalize(to)));
            float3 cross = math.cross(from, to);
            angle *= math.sign(math.dot(math.up(), cross));
            return math.degrees(angle);
        }

If they are already in there, let me know where. Preferably through documentation on your webcite.

Inizia da src/Unity.Mathematics/math.cs, in particolare dalle righe 98-111, e leggi le API math circostanti insieme alla discussione per individuare eventuali decisioni dei maintainer. Il lavoro è completato quando la funzionalità per gli angoli richiesta dispone di un’API concordata ed è integrata con una verifica adeguata al progetto.