Reworked encryption to use less heap allocated buffers for secrets.

Also some work on plugin system.

IdentityShroud.GraphQL/RegistrationExtensions.cs

@@ -0,0 +1,31 @@
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Routing;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace IdentityShroud.GraphQL;
+
+public static class RegistrationExtensions
+{
+    extension(IServiceCollection services)
+    {
+        public IServiceCollection AddIdentityShroudGraphQL()
+        {
+            services
+                .AddGraphQLServer()
+                .AddMutationConventions(applyToAllMutations: true)
+                .AddMutationType<Mutation>()
+                .AddQueryType<Query>();
+            
+            return services;
+        }
+    }
+
+    extension(IEndpointRouteBuilder app)
+    {
+        public IEndpointRouteBuilder MapIdentityShroudGraphQL()
+        {
+            app.MapGraphQL();
+            return app;
+        }
+    }
+}