improvement txpool code

[novosandara]

Description

Improvement txpool code

Changes include

• Bugfix (non-breaking change that solves an issue)
• Hotfix (change that solves an urgent issue, and requires immediate attention)
• New feature (non-breaking change that adds functionality)
• Breaking change (change that is not backwards-compatible and/or changes current functionality)

Breaking changes

Checklist

• I have assigned this PR to myself
• I have added at least 1 reviewer
• I have added the relevant labels
• I have updated the official documentation
• I have added sufficient documentation in code

Testing

• I have tested this code with the official test suite
• I have tested this code manually

Manual tests

Documentation update

Additional comments

[novosandara]

This PR introduces two optimizations to the txPool:

We observed that a significant portion of time during transaction validation in txpool is spent on determining the sender ("from" information) using p.signer.Sender(tx). To expedite the validation process for invalid transactions, we've postponed this check to a later stage. Valid transactions remain unaffected by this change, but it ensures quicker feedback for invalid transactions.

During transaction addition, we noticed that even when Trace logging isn't enabled by default, the transaction hash is unnecessarily converted to a string for logging purposes. To streamline this process, we've optimized the handling to avoid this conversion, enhancing efficiency.