Add methods for ZKInputs IntermStates generation

- Add L1Tx TxCompressedData method
- Add PoolL2Tx TxCompressedDataV2 method
- Update ProcessTxs logic
- Add ZKInputs Intermediate States & Fee parameters calculation

db/statedb/utils.go

@@ -160,3 +160,19 @@ func BJJCompressedTo256BigInts(pkComp babyjub.PublicKeyComp) [256]*big.Int {
 
 	return r
 }
+
+// formatAccumulatedFees returns an array of [nFeeAccounts]*big.Int containing
+// the balance of each FeeAccount, taken from the 'collectedFees' map, in the
+// order of the 'orderTokenIDs'
+func formatAccumulatedFees(collectedFees map[common.TokenID]*big.Int, orderTokenIDs []*big.Int) []*big.Int {
+	accFeeOut := make([]*big.Int, len(orderTokenIDs))
+	for i := 0; i < len(orderTokenIDs); i++ {
+		tokenID := common.TokenIDFromBigInt(orderTokenIDs[i])
+		if _, ok := collectedFees[tokenID]; ok {
+			accFeeOut[i] = collectedFees[tokenID]
+		} else {
+			accFeeOut[i] = big.NewInt(0)
+		}
+	}
+	return accFeeOut
+}