chore(tfstated): refactor helpers to their own package

pkg/helpers/json.go

@@ -0,0 +1,25 @@
+package helpers
+
+import (
+	"encoding/json"
+	"fmt"
+	"log/slog"
+	"net/http"
+)
+
+func Decode(r *http.Request, data any) error {
+	if err := json.NewDecoder(r.Body).Decode(&data); err != nil {
+		return fmt.Errorf("failed to decode json: %w", err)
+	}
+	return nil
+}
+
+func Encode(w http.ResponseWriter, status int, data any) error {
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(status)
+	if err := json.NewEncoder(w).Encode(data); err != nil {
+		slog.Error("failed to encode json", "err", err)
+		return fmt.Errorf("failed to encode json: %w", err)
+	}
+	return nil
+}