Promote indicator id to the same level as hazard type #569
Description
This issue stems from the discussion held in the Physical Risk and Resilience weekly meeting on January 11th 2026.
The question is whether we should be able to key impacts and risk measures by indicator id, in addition to the already present hazard type.
This amounts to promoting indicator id to the same level as hazard type as an identifier of impacts and measures.
This change is motivated by wanting to implement the methodology in 'Climate change-related statistical indicators' Statistics Paper Series No 48 from the European Central Bank. https://www.ecb.europa.eu/pub/pdf/scpsps/ecb.sps48~e3fd21dd5a.en.pdf?4826f6ee77d3ac7a681916b6d419b751
It would allow to compute and return indicator id-specific risk scores. This is important for hazards for which different indicators measure different types of impacts, like drought's consecutive dry days (CDD) and SPEI. In any case, it provides more granularity in the ouputs of physrisk, and aggregation among indicators at the risk measure level would still be possible.
We are openning a related pull request that incorporates this change #568