In transaction-sending APIs such as `eth_sendRawTransaction`, a submitted transaction
failing the configured txpool validation rules (i.e. fee too low) would cause an error to be
returned, even though the transaction was successfully added into the locals tracker.
Once added there, the transaction may even be included into the chain at a later time,
when fee market conditions change.
This change improves on this by performing the validation in the locals tracker, basically
skipping some of the validation rules for local transactions. We still try to add the tx to the
main pool immediately, but an error will only be returned for transactions which are
fundamentally invalid.
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Co-authored-by: Gary Rong <garyrong0905@gmail.com>
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