Metric for tracking throttled transactions

[netopyr]

Create metrics (Counter) for each transaction type and query type that track how often transactions of that type were throttled.

[netopyr]

I believe the places where the metrics should be increased are these (please validate, though):

• IngestChecker
• QueryWorkflowImpl
• DispatchProcessor

[david-bakin-sl]

There is already a metric for gas consumption so you can tell when the gas throttle was reached, but you don't get a count of transactions rejected because of the gas throttle.

This is by way of remiinder that for each of ContractCreate/ContractCall/EthereumTransactions we should be able to see two separate metrics: #TXs rejected due to TPS throttle, and #TXs rejected due to gas throttle.