Add support for storage command and crawler output

Partially addresses issue #3 by adding a simple `magellan list devices` command to list storage devices. To close the issue, this PR still requires including storage device information in the `crawler`'s output.

Reviewed-on: towk/magellan-ng#5

pkg/list.go

@@ -23,7 +23,22 @@ func PrintRemoteAssets(data []RemoteAsset, format string) {
 			fmt.Printf("%s:%d (%s) @%s\n", r.Host, r.Port, r.Protocol, r.Timestamp.Format(time.UnixDate))
 		}
 	default:
-		log.Error().Msg("PrintRemoteAssets: unrecognized format")
+		log.Error().Msg("unrecognized format")
+	}
+}
+
+func PrintMapFormat(data map[string]any, format string) {
+	switch strings.ToLower(format) {
+	case "json":
+		util.PrintJSON(data)
+	case "yaml":
+		util.PrintYAML(data)
+	case "none":
+		for k, v := range data {
+			fmt.Printf("%s: %v\n", k, v)
+		}
+	default:
+		log.Error().Msg("unrecognized format")
 	}
 }