dragon refactor, objectives and use GenericAntag (#20201)

Co-authored-by: deltanedas <@deltanedas:kde.org>

Content.Server/Roles/DragonRoleComponent.cs

@@ -0,0 +1,12 @@
+using Content.Server.Dragon;
+using Content.Shared.Roles;
+
+namespace Content.Server.Roles;
+
+/// <summary>
+/// Role used to keep track of space dragons for antag purposes.
+/// </summary>
+[RegisterComponent, Access(typeof(DragonSystem))]
+public sealed partial class DragonRoleComponent : AntagonistRoleComponent
+{
+}