pub async fn next_l1_batch_number(&self) -> L1BatchNumber {
        self.next_l1_batch_number_opt()
            .await
            .expect("Next L1 batch number is not set for initialized RocksDB cache")
    }
Returns the last processed l1 batch number + 1.

# Panics

Panics on RocksDB errors.
core/lib/state/src/rocksdb/mod.rs