Returns Nx1 vector len, the lengths of all segments [in µm] in
tree intree using the X, Y and Z coordinates and the adjacency matrix.
Example:
>> len_tree (sample2_tree)'
[0, 10, 10, 10, 10, 9, 10, 11, 8, 10, 10, 7, 9, 11, 9]
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