Feat/usage stats collection (#317)

* feat: implement anonymous usage data collection

Co-authored-by: Joseph Milazzo <joseph.v.milazzo@gmail.com>

API/appsettings.Development.json

@@ -3,6 +3,11 @@
     "DefaultConnection": "Data source=kavita.db"
   },
   "TokenKey": "super secret unguessable key",
+  "StatsOptions": {
+    "ServerUrl": "http://localhost:5002",
+    "ServerSecret": "here's where the api key goes",
+    "SendDataAt": "23:50"
+  },
   "Logging": {
     "LogLevel": {
       "Default": "Debug",