feat: Make notifier and program async

Using asyncio library, notification are now trigerred
asynchronously.

docs/waiting_list.json

@@ -0,0 +1,72 @@
+curl 'https://sport.nubapp.com/api/v4/activities/activity-calendar/19291431/basicInfo?app_version=5.09.21^&id_application=81560887' \
+  -H 'User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:140.0) Gecko/20100101 Firefox/140.0' \
+  -H 'Accept: application/json, text/plain, */*' \
+  -H 'Accept-Language: en-GB,en;q=0.8,fr-FR;q=0.5,fr;q=0.3' \
+  -H 'Accept-Encoding: gzip, deflate, br, zstd' \
+  -H 'Referer: https://box.resawod.com/' \
+  -H 'Content-Type: application/x-www-form-urlencoded' \
+  -H 'Nubapp-Origin: user_apps' \
+  -H 'Origin: https://box.resawod.com' \
+  -H 'Sec-GPC: 1' \
+  -H 'Connection: keep-alive' \
+  -H 'Sec-Fetch-Dest: empty' \
+  -H 'Sec-Fetch-Mode: cors' \
+  -H 'Sec-Fetch-Site: cross-site' \
+  -H 'Priority: u=0' \
+  -H 'TE: trailers'
+
+{
+  "message": "All right! Here is your data.",
+  "data": {
+    "activity_calendar": {
+      "id_activity_calendar": 19291431,
+      "name_activity": "CONDITIONING LOUVRE 3",
+      "description": "\\u003Cp\\u003EWod Condi, de la simplicit\\u00e9 mais beaucoup d\\u0027intensit\\u00e9... des erg mais pas seulement, des mouvements de CrossFit qui vous permettrons d\\u0027am\\u00e9liorer vos capacit\\u00e9s a\\u00e9robies\\u003C\\/p\\u003E",
+      "id_activity": 43932,
+      "id_category_activity": 677,
+      "start_timestamp": "2025-07-23 18:30:00",
+      "end_timestamp": "2025-07-23 19:15:00",
+      "n_inscribed": 12,
+      "n_capacity": 12,
+      "n_waiting_list": 3,
+      "n_capacity_waiting_list": 8,
+      "id_trainer": null,
+      "is_course": false,
+      "cancelled": false,
+      "guest_info": {
+        "can_join": true,
+        "available_booking_options": [],
+        "errors": 0,
+        "errors_by_memberships": [],
+        "join_as_normal_user": false,
+        "vouchers": [],
+        "voucher_autopay": false,
+        "unableToBookUntilDate": null,
+        "unableToBookUntilTime": null,
+        "best_booking_option": {
+          "type": 2,
+          "price": 0,
+          "membershipId": null,
+          "discountId": null,
+          "discountValue": null
+        },
+        "price": 0,
+        "price_befdis": 0,
+        "user_attending": false,
+        "user_waiting": false
+      },
+      "facilities": [],
+      "image": null,
+      "color": "#a74cd6",
+      "max_guests": 0,
+      "guest_prices": {
+        "1": 0,
+        "2": 0,
+        "3": 0
+      },
+      "id_language": null
+    }
+  },
+  "success": true,
+  "status": 200
+}