feat(txpool): only try demoting txns from accounts that were active

[omerfirmak]

txpool demotes pending txns only if their nonce is now lower than the nonce in the latest state 
or the account no longer has enough funds to cover the costs. Unless the account in question 
was active since the last txpool reorg, there is no way that it's nonce changed or balance decreased.

for time periods where txpool is heavily congested, demote can take multiple seconds due to all the state access that it needs to do per pending txn account.

[jwasinger]

From a glance, it appears the IO overhead is per account in the pending set (balance + nonce lookup). not per tx.

[rjl493456442]

I think it might be a reasonable change. Have you ever estimated how much performance gain we can have with this change?
Or do you know what's the ratio between the all pending accounts and the active accounts?

[omerfirmak]

I think it might be a reasonable change. Have you ever estimated how much performance gain we can have with this change? Or do you know what's the ratio between the all pending accounts and the active accounts?

I don't have numbers on ETH mainnet, but on Scroll this change brought demoteUnexecutables runtime from ~800msecs to ~15msecs with roughly 28k pending txns. But keep in mind Scroll blocks are significantly smaller (~80Txns)