feat: add a new single-line formatter for console_exporter

Closes #7

example/main.go

@@ -26,8 +26,11 @@ func main() {
 
 	envFilter := "OBSERVER_CONSOLE"
 
+	singlelineFmt := console_exporter.NewSimpleSinglelineFormatter()
+
 	exps = append(exps, exporters.DevConsoleExporter(console_exporter.ProcessorOptions{
 		FilterFromEnvVar: &envFilter,
+		TraceFormatter:   &singlelineFmt,
 	}))
 
 	gelfExp, err := exporters.GelfExporter()