GridInformationKey should implemented IEquatable<GridInformationKey> and override GetHashCode() to avoid GC alloc

[tanghuipang]

as GridInformationKey used as a Dictionary key, current version will alloc 292B GC when call dict.TryGetValue(). For better performance it should be like below:

    internal struct GridInformationKey : IEquatable<GridInformationKey>
    {
        public Vector3Int position;
        public String name;

        public bool Equals(GridInformationKey key)
        {
            return position == key.position && name == key.name;
        }

        public override int GetHashCode()
        {
            return position.GetHashCode() + name.GetHashCode();
        }
    }

[ChuanXin-Unity]

Thanks! We will check out this issue!