Fix issues with Journal handling

Implement basic database
Handle startup events
only send events after the most recent LoadGame

Pulsar/Context/Configuration/LoadGameConfiguration.cs

@@ -0,0 +1,13 @@
+namespace Pulsar.Context.Configuration;
+
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+using Observatory.Framework.Files.Journal.Startup;
+
+public class LoadGameConfiguration : IEntityTypeConfiguration<LoadGame>
+{
+    public void Configure(EntityTypeBuilder<LoadGame> builder)
+    {
+        builder.HasKey(j => j.Timestamp);
+    }
+}