Resolve which OCPI 2.2.1 tariff dimension and Tariff Element wins when multiple price components can apply to the same session

Steps

1. Enumerate every Tariff Element on the applicable Tariff object and, for each of the four PriceComponent dimensions (ENERGY, TIME, PARKING_TIME, FLAT), find the first Tariff Element in list order whose TariffRestrictions match the moment being billed.
2. Apply at most one PriceComponent per dimension at any instant, but allow different dimensions to be simultaneously active (e.g. ENERGY and PARKING_TIME billing concurrently after charging completes).
3. For ENERGY, TIME and PARKING_TIME, multiply the matched step_size by its fixed unit (1 Wh for ENERGY, 1 second for TIME/PARKING_TIME) and round usage up to the next whole step before applying price.
4. Recompute which Tariff Element matches whenever a restriction boundary is crossed mid-session (e.g. crossing from off-peak to peak, or exceeding a duration threshold) rather than locking in the first match for the whole session.
5. Cross-check the computed charge against the CDR's own total_cost and per-period breakdown once the session ends via the CDRs module, since that's the authoritative billed amount.