support to calculate centroids from list of vectors

[colombod]

To go from

  var accumulated = vectors.Aggregate((Enumerable.Repeat(0f, 1536), 0), (acc, d) => (acc.Item1.Zip(d, (a, b) => a + b).ToArray(), acc.Item2 + 1));

  return accumulated.Item1.Select(e => e/ accumulated.Item2).ToArray();

To

 var data = new[]
 {
     new []{ 1f, 1f, 1f},
     new []{ 2f, 2f, 2f},
     new []{ 1f, 2f, 3f}
 };

 var centroid = data.Centroid();