Compute edge distance from single position attribute, add constant

[funkey]

This allows to represent node positions in a single attribute. Also added constant costs.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 93.75%. Comparing base (1216dec) to head (cb36ecb).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #95 +/- ## ========================================== + Coverage 93.71% 93.75% +0.03% ========================================== Files 33 33 Lines 812 816 +4 ========================================== + Hits 761 765 +4 Misses 51 51 ```

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