refactor: move classes to separate files

src/StevesBot.Worker.Tests/Unit/DiscordEventTypes.cs

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+namespace StevesBot.Worker.Tests.Unit;

src/StevesBot.Worker.Tests/Unit/IdentifyDataTests.cs

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+using StevesBot.Worker.Discord.Gateway.Events.Data;
+
+namespace StevesBot.Worker.Tests.Unit;
+
+public class IdentifyDataTests
+{
+  [Fact]
+  public void Constructor_WhenCalled_ItShouldReturnInstance()
+  {
+    var result = new IdentifyData();
+
+    result.Token.Should().Be(string.Empty);
+    result.Properties.Should().BeEquivalentTo(new IdentifyProperties());
+    result.Presence.Should().BeEquivalentTo(new UpdatePresenceData());
+    result.Intents.Should().Be(0);
+  }
+
+  [Fact]
+  public void Constructor_WhenCalledWithParameters_ItShouldReturnInstance()
+  {
+    var token = "test_token";
+    var properties = new IdentifyProperties
+    {
+      Os = "test_os",
+      Browser = "test_browser",
+      Device = "test_device",
+    };
+
+    var presence = new UpdatePresenceData
+    {
+      Status = "test_status",
+      Activities = [],
+    };
+
+    var intents = 123456789;
+
+    var result = new IdentifyData
+    {
+      Token = token,
+      Properties = properties,
+      Presence = presence,
+      Intents = intents
+    };
+
+    result.Token.Should().Be(token);
+    result.Properties.Should().BeSameAs(properties);
+    result.Presence.Should().BeSameAs(presence);
+    result.Intents.Should().Be(intents);
+  }
+}