Function pimsync::config::init_storage

async fn init_storage(
    raw_storages: &mut HashMap<String, Scfg>,
    parsed_storages: &mut HashMap<String, EitherStorage>,
    storage_name: &str,
) -> Result<EitherStorage>

If the storage is in raw_storages, initialise it and add it into parsed_storages. Otherwise, find it in parsed_storages.