feat(node): filter txns by base fee #1321
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This PR adds extra step to filter out txn below the base fee.
Previous, if a txn's fee cap is below the base fee, the txn priority is set to I64::MIN so that cometbft will deprioritise this kind of transactions. From stress testing, it turns out, cometbft will still send them over after some time. Adding this extra layer to ensure they wont be executed on chain.
This change is