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/strings.go

@@ -0,0 +1,10 @@
+package util
+
+import "strings"
+
+func TidyJSON(s string) string {
+	s = strings.ReplaceAll(s, "\n", "")
+	s = strings.ReplaceAll(s, "\t", "")
+	s = strings.ReplaceAll(s, "  ", "")
+	return strings.ReplaceAll(s, "\"", "'")
+}