chore: continue porting code and adding test coverage

src/StevesBot.Worker/Discord/Events/DiscordEvent.cs

@@ -3,7 +3,7 @@ namespace StevesBot.Worker.Discord.Events;
 internal record DiscordEvent
 {
   [JsonPropertyName("op")]
-  public int Op { get; init; }
+  public int OpCode { get; init; }
 
   [JsonPropertyName("s")]
   public int? Sequence { get; init; }

src/StevesBot.Worker/Discord/Events/DiscordEventConverter.cs

@@ -1,6 +1,6 @@
 namespace StevesBot.Worker.Discord.Events;
 
-internal class DiscordEventConverter : JsonConverter<DiscordEvent>
+internal sealed class DiscordEventConverter : JsonConverter<DiscordEvent>
 {
   private const string OpPropertyName = "op";
 

src/StevesBot.Worker/Discord/Events/HelloDiscordEvent.cs

@@ -1,13 +1,13 @@
 namespace StevesBot.Worker.Discord.Events;
 
-internal record HelloDiscordEvent : DiscordEvent
+internal sealed record HelloDiscordEvent : DiscordEvent
 {
   [JsonPropertyName("d")]
   public new HelloData? Data { get; init; }
 }
 
-internal record HelloData
+internal sealed record HelloData
 {
   [JsonPropertyName("heartbeat_interval")]
   public int HeartbeatInterval { get; init; }
-}
+}