Reworked code around signing keys have key details much more isolated from the other parts of the program.

IdentityShroud.Core/Contracts/IRealmService.cs

@@ -6,6 +6,7 @@ namespace IdentityShroud.Core.Contracts;
 
 public interface IRealmService
 {
+    Task<Realm?> FindById(Guid id, CancellationToken ct = default);
     Task<Realm?> FindBySlug(string slug, CancellationToken ct = default);
         
     Task<Result<RealmCreateResponse>> Create(RealmCreateRequest request, CancellationToken ct = default);