Add auto-registration mechanism

- Add User registration mechanism when adding auth provider id to claims, if no User Id corresponds to the auth provider Id
- Swallow unique constraint violation for unique auth provider id on user table, in case of duplicate requests
- Add Serilog logging
- Add no bookmarks and no tags message when none is found on Bookmark List page

YABA.API/appsettings.json

@@ -6,6 +6,18 @@
       "Microsoft.Hosting.Lifetime": "Information"
     }
   },
+  "Serilog": {
+    "MinimumLevel":  "Information",
+    "WriteTo": [
+      {
+        "Name": "File",
+        "Args": {
+          "path": "Logs/log-.txt",
+          "rollingInterval": "Day"
+        }
+      }
+    ]
+  },
   "WebClient": {
     "Url": "https://localhost:3000"
   }