Optimize hash calculation

[liudi4046]

Optimize function extractTransactionsFromSlot and sequencingBatchStep with Goroutine

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[hexoscott]

Thank you for the PR @liudi4046. There are a few other things going on in parallel to this:

• checking if we need the transaction hash on the "happy path" at all. If not we can simply remove this and only call it when we need it for a log for example
• parallel sender calculation - this we're looking to make some changes to as it degrades performance calling this repeatedly for many transactions so we shouldn't need to parallelise this once we have made these changes.

Let's keep this active for now until these points above have been resolved and if still needed we can address the updates and merge at that time.

[IvanBelyakoff]

Closing it as no actual performance gain for hash calculation #1603
Sender recovery improvement implemented in #1636