Add statistics logs and metric for sequencer

[zjg555543]

When stress-testing the sequencer, we added a new stats log to give better insights. Hope it helps!

[INFO] [02-18|04:15:37.370] Batch<50>, TotalDuration<279ms>, GasUsed<5450276>, Block<1>, Tx<30>, GetTxPause<26>, ReprocessTx<0>, GasOverTx<0>, ZKOverflowBlock<1>, InvalidTx<0>, SequencingBatchTiming<302ms>, GetTxTiming<1ms>, ProcessTx<178ms>, GetTxPauseTiming<131ms>, PbStateTiming<39ms>, ZkIncIntermediateHashesTiming<18ms>, FinaliseBlockWriteTiming<0ms>, BatchCommitDBTiming<15ms>, BatchCloseReason<> 

• Batch<50>: Indicates the batch ID being processed (Batch 50).
• TotalDuration<279ms>: The total time taken to process this batch, including all operations.
• GasUsed<5450276>: The total amount of gas consumed by transactions in this batch.
• Block<1>: The number of blocks generated during this batch.
• Tx<30>: The number of transactions included in this batch.
• GetTxPause<26>: The number of times the system paused while fetching transactions.
• ReprocessTx<0>: The number of transactions that had to be reprocessed.
• GasOverTx<0>: The number of transactions that exceeded gas limits.
• ZKOverflowBlock<1>: The number of blocks where ZK (Zero-Knowledge proof) constraints were exceeded.
• InvalidTx<0>: The number of invalid transactions found in this batch.
• SequencingBatchTiming<302ms>: The total time spent sequencing the batch, including delays.
• GetTxTiming<1ms>: The time taken to fetch transactions for this batch.
• ProcessTx<178ms>: The total time spent processing transactions.
• GetTxPauseTiming<131ms>: The cumulative time spent in transaction retrieval pauses.
• PbStateTiming<39ms>: The time taken to update the protocol buffer (Pb) state.
• ZkIncIntermediateHashesTiming<18ms>: The time spent computing intermediate hashes for ZK proofs.
• FinaliseBlockWriteTiming<0ms>: The time taken to finalize writing the block (0ms indicates no additional delay).
• BatchCommitDBTiming<15ms>: The time taken to commit the batch data to the database.
• BatchCloseReason<>: The reason for closing the batch (empty in this case, meaning no specific reason was logged).