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

internal/util/print.go

@@ -0,0 +1,25 @@
+package util
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"github.com/rs/zerolog/log"
+	"gopkg.in/yaml.v2"
+)
+
+func PrintJSON(data any) {
+	b, err := json.MarshalIndent(data, "", "  ")
+	if err != nil {
+		log.Error().Err(err).Msgf("failed to marshal scanned results to JSON")
+	}
+	fmt.Println(string(b))
+}
+
+func PrintYAML(data any) {
+	b, err := yaml.Marshal(data)
+	if err != nil {
+		log.Error().Err(err).Msgf("failed to marshal scanned results to JSON")
+	}
+	fmt.Printf("%s\n", string(b))
+}