Switch Owned value types to ComplexProperty which is better fit.

This requires fluent configuration. Also made some conversion registration context wide.

IdentityShroud.Core/Model/RealmDek.cs

@@ -0,0 +1,24 @@
+using IdentityShroud.Core.Security;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace IdentityShroud.Core.Model;
+
+public record RealmDek
+{
+    public required DekId Id { get; init; }
+    public required bool Active { get; set; }
+    public required string Algorithm { get; init; }
+    public required EncryptedDek KeyData { get; init; }
+    public required Guid RealmId { get; init; }
+}
+
+public class RealmDekConfiguration : IEntityTypeConfiguration<RealmDek>
+{
+    public void Configure(EntityTypeBuilder<RealmDek> b)
+    {
+        b.ToTable("realm_dek");
+        b.HasKey(e => e.Id);
+        b.ComplexProperty(e => e.KeyData, e => e.IsRequired());
+    }
+}