reservoir storage

Live storage from ONE CWC weekly bulletin (the latest, or the one on/before `date`). level: national | region | state | basin | reservoir. entity: name filter (substring), e.g. 'Gujarat', 'Krishna', 'Sardar Sarovar'. state / region: filters (reservoir level carries both). measures: live_storage_bcm, live_capacity_frl_bcm, live_storage_last_year_bcm, normal_storage_bcm, pct_of_live_capacity, pct_of