feat: output system — table/json/yaml/raw printers with struct tag driven tables

internal/output/json.go

@@ -0,0 +1,12 @@
+package output
+
+import (
+	"encoding/json"
+	"io"
+)
+
+func printJSON(w io.Writer, data any) error {
+	enc := json.NewEncoder(w)
+	enc.SetIndent("", "  ")
+	return enc.Encode(data)
+}