miner: polish miner configuration (#19480)

* cmd, eth, miner: disable advance sealing if user require

* cmd, console, miner, les, eth: wrap the miner config

* eth: remove todo

* cmd, miner: revert noadvance flag

The reason for this is: if the transaction execution is even longer
than block time, then this kind of transactions is DoS attack.

les/backend.go

@@ -170,7 +170,7 @@ func New(ctx *node.ServiceContext, config *eth.Config) (*LightEthereum, error) {
 
 	gpoParams := config.GPO
 	if gpoParams.Default == nil {
-		gpoParams.Default = config.MinerGasPrice
+		gpoParams.Default = config.Miner.GasPrice
 	}
 	leth.ApiBackend.gpo = gasprice.NewOracle(leth.ApiBackend, gpoParams)
 	return leth, nil