New: Add config file setting for CGNAT authentication bypass

(cherry picked from commit 4c41a4f368046f73f82306bbd73bec992392938b)

src/NzbDrone.Core/Configuration/ConfigFileProvider.cs

@@ -65,6 +65,7 @@ namespace NzbDrone.Core.Configuration
         string PostgresPassword { get; }
         string PostgresMainDb { get; }
         string PostgresLogDb { get; }
+        bool TrustCgnatIpAddresses { get; }
     }
 
     public class ConfigFileProvider : IConfigFileProvider
@@ -479,5 +480,7 @@ namespace NzbDrone.Core.Configuration
             SetValue("ApiKey", GenerateApiKey());
             _eventAggregator.PublishEvent(new ApiKeyChangedEvent());
         }
+
+        public bool TrustCgnatIpAddresses => _authOptions.TrustCgnatIpAddresses ?? GetValueBoolean("TrustCgnatIpAddresses", false, persist: false);
     }
 }