fix: check op-batcher config flags when instantiating

op-batcher/batcher/batch_submitter.go

@@ -27,6 +27,9 @@ func Main(version string, cliCtx *cli.Context) error {
 		return err
 	}
 	cfg := NewConfig(cliCtx)
+	if err := cfg.Check(); err != nil {
+		return fmt.Errorf("invalid CLI flags: %w", err)
+	}
 
 	l := oplog.NewLogger(oplog.AppOut(cliCtx), cfg.LogConfig)
 	oplog.SetGlobalLogHandler(l.GetHandler())

op-batcher/batcher/config.go

@@ -96,6 +96,8 @@ type CLIConfig struct {
 }
 
 func (c CLIConfig) Check() error {
+	// TODO: check the sanity of flags loaded directly like MaxPendingTransactions
+
 	if err := c.MetricsConfig.Check(); err != nil {
 		return err
 	}
@@ -105,6 +107,9 @@ func (c CLIConfig) Check() error {
 	if err := c.TxMgrConfig.Check(); err != nil {
 		return err
 	}
+	if err := c.RPCFlag.Check(); err != nil {
+		return err
+	}
 	return nil
 }