Store ambient sound entities on a component tree. (#13110)

Content.Client/Audio/AmbientSoundTreeComponent.cs

@@ -0,0 +1,14 @@
+using Content.Shared.Audio;
+using Robust.Shared.ComponentTrees;
+using Robust.Shared.Physics;
+
+namespace Content.Client.Audio;
+
+/// <summary>
+/// Samples nearby <see cref="AmbientSoundComponent"/> and plays audio.
+/// </summary>
+[RegisterComponent]
+public sealed class AmbientSoundTreeComponent : Component, IComponentTreeComponent<AmbientSoundComponent>
+{
+    public DynamicTree<ComponentTreeEntry<AmbientSoundComponent>> Tree { get; set; } = default!;
+}