feat(pricing_group_keys): Add grouped_by logic for per event aggregations #3789
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Context
This PR follows #3666 and #3681 as part of the epic to add grouped_by feature on all charge models and not only on the standard one like today.
Description
This PR is the second step:
For now the grouped aggregation remains remains whitelisted only on the standard and dynamic charge model. This will change in the next step of this feature.