Reworked encryption to use less heap allocated buffers for secrets.

Also some work on plugin system.

IdentityShroud.GraphQL/Query.cs

@@ -0,0 +1,26 @@
+susing IdentityShroud.Core.Contracts;
+using IdentityShroud.Core.Model;
+
+namespace IdentityShroud.GraphQL;
+
+public class Query
+{
+    public string GetHello() => "Hello, world!";
+
+    public async Task<Realm?> GetRealms(
+        Guid id,
+        [Service] IRealmService realmService)
+    {
+        return await realmService.FindById(id);
+    }
+}
+
+public class Mutation
+{
+    public async Task<Realm> RealmCreate(string name)
+    {
+        Realm r = new();
+
+        return r;
+    }
+}