feat(custom_agg): Base structure for custom aggregation #1881
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Context
Some of our customers have express a need for aggregation and charge models that does not fit into the current logic in place in Lago, like for example having a single aggregation for 2 different properties, but make the price per unit changing based on the position of the event.
This feature aims to propose a way to build custom aggregation logic for specific cases.
Description
This PR adds the base logic for
BillableMetrics::Aggregations::CustomService
andCharges::ChargeModels::CustomService
Note: the aggregation logic itself will come in a next PR(s)