chore: begin porting code from playground

src/StevesBot.Worker/Discord/DiscordClientException.cs

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+namespace StevesBot.Worker.Discord;
+
+internal class DiscordClientException : Exception
+{
+  public DiscordClientException()
+  {
+  }
+
+  public DiscordClientException(string message) : base(message)
+  {
+  }
+
+  public DiscordClientException(string message, Exception innerException) : base(message, innerException)
+  {
+  }
+}

src/StevesBot.Worker/Discord/DiscordClientOptions.cs

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+namespace StevesBot.Worker.Discord;
+
+internal class DiscordClientOptions
+{
+  public string ApiUrl { get; init; } = string.Empty;
+  public string AppToken { get; init; } = string.Empty;
+  public int Intents { get; init; }
+}

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

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+namespace StevesBot.Worker.Discord.Events;
+
+internal record DiscordEvent
+{
+  [JsonPropertyName("op")]
+  public int Op { get; init; }
+
+  [JsonPropertyName("s")]
+  public int? Sequence { get; init; }
+
+  [JsonPropertyName("t")]
+  public string? Type { get; init; }
+
+  [JsonPropertyName("d")]
+  public object? Data { get; init; }
+}

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

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+namespace StevesBot.Worker.Discord.Events;
+
+internal class DiscordEventConverter : JsonConverter<DiscordEvent>
+{
+  private const string OpPropertyName = "op";
+
+  public override DiscordEvent? Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+  {
+    using var jsonDoc = JsonDocument.ParseValue(ref reader);
+    var root = jsonDoc.RootElement;
+    var op = root.GetProperty(OpPropertyName).GetInt32();
+
+    return op switch
+    {
+      DiscordOpCodes.Hello => JsonSerializer.Deserialize<HelloDiscordEvent>(root.GetRawText(), options),
+      _ => JsonSerializer.Deserialize<DiscordEvent>(root.GetRawText(), options)
+    };
+  }
+
+  public override void Write(Utf8JsonWriter writer, DiscordEvent value, JsonSerializerOptions options)
+  {
+    throw new NotImplementedException();
+  }
+}

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

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+namespace StevesBot.Worker.Discord.Events;
+
+internal static class DiscordOpCodes
+{
+  public const int Hello = 10;
+}

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

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