feat: initial DualBadge.

demo/Ursa.Demo/Pages/DualBadgeDemo.axaml

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+<UserControl
+    x:Class="Ursa.Demo.Pages.DualBadgeDemo"
+    xmlns="https://github.com/avaloniaui"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    xmlns:u="https://irihi.tech/ursa"
+    d:DesignHeight="450"
+    d:DesignWidth="800"
+    mc:Ignorable="d">
+    <StackPanel HorizontalAlignment="Left">
+        <u:DualBadge 
+            Header="build">
+            <u:DualBadge.Icon>
+                <PathIcon
+                    Width="16"
+                    Height="16"
+                    Data="M12 23C18.0751 23 23 18.0751 23 12C23 5.92487 18.0751 1 12 1C5.92487 1 1 5.92487 1 12C1 18.0751 5.92487 23 12 23ZM14 7C14 8.10457 13.1046 9 12 9C10.8954 9 10 8.10457 10 7C10 5.89543 10.8954 5 12 5C13.1046 5 14 5.89543 14 7ZM9 10.75C9 10.3358 9.33579 10 9.75 10H12.5C13.0523 10 13.5 10.4477 13.5 11V16.5H14.25C14.6642 16.5 15 16.8358 15 17.25C15 17.6642 14.6642 18 14.25 18H9.75C9.33579 18 9 17.6642 9 17.25C9 16.8358 9.33579 16.5 9.75 16.5H10.5V11.5H9.75C9.33579 11.5 9 11.1642 9 10.75Z"/>
+            </u:DualBadge.Icon>
+            passing
+        </u:DualBadge>
+    </StackPanel>
+</UserControl>

demo/Ursa.Demo/Pages/DualBadgeDemo.axaml.cs

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+using Avalonia.Controls;
+
+namespace Ursa.Demo.Pages;
+
+public partial class DualBadgeDemo : UserControl
+{
+    public DualBadgeDemo()
+    {
+        InitializeComponent();
+    }
+}