Refactor exception handling with new mapping system

Updated `GlobalExceptionHandlerOptions` to use a new `_registeredMappings` dictionary for `HttpExceptionMapping` objects, enhancing flexibility in mapping exceptions to HTTP responses. Renamed `RegisterException` to `Add` to reflect its new functionality. Removed the `HttpResponse` record definition and introduced a new `HttpExceptionMapping` record, which includes a static `Create` method for easier instantiation of mappings.

DigitalData.Core.Exceptions.Middleware/GlobalExceptionHandlerOptions.cs

@@ -1,14 +1,12 @@
-using System.Net;
-
-namespace DigitalData.Core.Exceptions.Middleware;
+namespace DigitalData.Core.Exceptions.Middleware;
 
 public class GlobalExceptionHandlerOptions
 {
-    private readonly Dictionary<Type, HttpResponse> _registeredExceptions = new();
+    private readonly Dictionary<Type, HttpExceptionMapping> _registeredMappings = new();
 
-    public GlobalExceptionHandlerOptions RegisterException<TException>(HttpStatusCode statusCode, string? message = null) where TException : Exception
+    public GlobalExceptionHandlerOptions Add(HttpExceptionMapping mapping)
     {
-        _registeredExceptions[typeof(TException)] = new HttpResponse(statusCode, message);
+        _registeredMappings[mapping.ExceptionType] = mapping;
         return this;
     }
 }