This commit changes how a new input sweep request is handled - now we will query the mempool and see if it's already been spent. If so, we'll update its state as we may need to RBF this input.
UtxoAggregator
MaxFeeRate
SatPerVbyte
DetermineFeePerKw
Estimate
testify/mock
MockSweeperStore
GetTx
DeleteTx
TxRecord
createSweepTx
FeePreference
FeeEstimateInfo