Feat(metadata): Write units attribute in derived datasets (metadata)
Created by: danesss
Issue
ECDC-3368
Description of work
We modify Value class to also receive a function to write attributes and assume that Value represents a dataset to be written with or without attributes. Previously, Value could be called separately with a group/dataset and a function to respectively create a dataset in the group / attribute in the dataset. I do not see the usefulness of such generalisation, Value class is used exclusively to create derived datasets, so it seems simpler to model it as a dataset and nothing else.
Checklist
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Changes have been documented in changes.md