Refactor API to use IOptions pattern with IConfigurationSection binding

.gitignore

@@ -48,3 +48,6 @@ docfx.zip
 # Ignoring Misc
 .DS_Store
 .github/.DS_Store
+
+# Ignoring C# Dev Kit language service cache files
+*.lscache

Auth0.AspNetCore.Authentication.Api.Playground/Program.cs

@@ -10,25 +10,21 @@
 builder.Services.AddSwaggerGen();
 
 // Adds Auth0 JWT validation to the API
-builder.Services.AddAuth0ApiAuthentication(options =>
-{
-    options.JwtBearerOptions = new JwtBearerOptions
-    {
-        Audience = builder.Configuration["Auth0:Audience"]
-                   ?? throw new InvalidOperationException("Auth0:Audience is required")
-    };
-    options.Domain = builder.Configuration["Auth0:Domain"]
-                     ?? throw new InvalidOperationException("Auth0:Domain is required");
-    options.JwtBearerOptions.Events = new JwtBearerEvents
+// Configuration is automatically bound from appsettings.json "Auth0" section
+builder.Services.AddAuth0ApiAuthentication(
+    builder.Configuration.GetSection("Auth0"),
+    configureJwtBearer: jwt =>
     {
-        // Custom event just to log the token received in the request.
-        OnMessageReceived = context =>
+        jwt.Events = new JwtBearerEvents
         {
-            Console.WriteLine($"Token extracted? : {(!string.IsNullOrEmpty(context.Token) ? "yes" : "no")}");
-            return Task.CompletedTask;
-        }
-    };
-}).WithDPoP();
+            // Custom event just to log the token received in the request.
+            OnMessageReceived = context =>
+            {
+                Console.WriteLine($"Token extracted? : {(!string.IsNullOrEmpty(context.Token) ? "yes" : "no")}");
+                return Task.CompletedTask;
+            }
+        };
+    }).WithDPoP();
 
 builder.Services.AddAuthorization();
 
@@ -45,7 +41,7 @@
 app.UseAuthentication();
 app.UseAuthorization();
 
 app.MapGet("/open-endpoint", () =>
     {
         var responseMessage = "This endpoint is available to all users.";
         return responseMessage;
@@ -53,7 +49,7 @@
     .WithName("AccessOpenEndpoint")
     .WithOpenApi();
 
 app.MapGet("/restricted-endpoint", () =>
     {
         var responseMessage = "You are special. This endpoint is available only to select users.";
         return responseMessage;