feat: split authentication tags since replies have required data field (unlike...

feat: split authentication tags since replies have required data field (unlike submissions) (planning#460 (closed))

and since attachment is now used in two places, extract it into a "part" for DRY reasons

templates/accept_reply.json

+{
+  "$schema": "https://schema.fitko.de/fit-connect/set-payload/SCHEMA_VERSION/set-payload.schema.json",
+  "jti": "6872b19f-5ee2-47d7-a0e9-ebfe87ab2563",
+  "iss": "40847c29-06aa-40e2-bf28-c29884c694c4",
+  "iat": 1622796532,
+  "sub": "reply:02bf1d9f-282d-4abf-810a-c4104baf0afe",
+  "txn": "case:452b5ee6-35df-441a-bd39-6141723cf914",
+  "events": {
+    "https://schema.fitko.de/fit-connect/events/submit-reply": {
+      "authenticationTags": {
+        "metadata": "XFBoMYUZodetZdvTiFvSkQ",
+        "data": "UCGiqJxhBI3IFVdPalHHvA",
+        "attachments": {
+          "0b799252-deb9-42b0-98d3-c50d24bbafe0": "rT99rwrBTbTI7IJM8fU3El",
+          "25abf553-0e53-43b9-a14a-1581b32a9ee5": "i7226HEB7IchCxNuh7lCiu",
+          "046a9fa5-bed6-494b-aab6-d41056c6db79": "d48LxeolRdtFF4nzQibeYO"
+        }
+      }
+    }
+  }
+}