fix: filter out timespan as key for accumulator #516
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Description
Adding "timespan" as a key to be ignored in the building of accumulator objects.
What problem does this change solve?
Accumulator objects are created with different identifiers, depending of the 'timespan' value for the field they encounter first.
This leads to incomplete accumulations when fields have different values of timespan (independently of field steps).
This PR filters this key out for building accumulators, since this key is related to specific temporal metadata.
What issue or task does this change relate to?
Closes #517
Additional notes
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