Update RollappPendingSubmissionsSkewBatches each block

[Northa]

dymint/block/submit.go

Lines 80 to 85 in ed72d9b

	types.RollappPendingSubmissionsSkewBytes.Set(float64(pendingBytes.Load()))
	types.RollappPendingSubmissionsSkewBlocks.Set(float64(unsubmittedBlocks()))
	submitter.Nudge()
	}
	})

During some internal tests i noticed that rollapp_pending_submissions_skew_batches metric not updating in real time.

Steps to reproduce.

1. a working rollapp setup with da-client.
2. restart\stop hub rpc.
3. Simulate a load test by sending some txs into rollapp.
4. Monitor the rollapp_pending_submissions_skew_batches metric.

possible fix: Northa@9c68066

UPDATE2:
When it comes to pause block production due to too many batches are pending submission metrics are not updating as well.
Affected metrics

rollapp_pending_submissions_skew_bytes
rollapp_pending_submissions_skew_batches
rollapp_pending_submissions_skew_blocks

time="Nov 12 13:45:31.686" level=error msg="Enough bytes to build a batch have been accumulated, but too many batches are pending submission. Pausing block production until a signal is consumed.[]" module=block_manager

Not sure but probably metrics must be updated there

dymint/block/submit.go

Lines 129 to 131 in 30a84df

	ticker.Reset(maxBatchTime)
	pending = uatomic.Uint64Sub(&pendingBytes, nConsumed)
	logger.Info("Submitted a batch to both sub-layers.", "n bytes consumed from pending", nConsumed, "pending after", pending) // TODO: debug level