feat: configure audio for dialogue interface

Assets/Editor/Utils/BackdropHandlePropertyDrawer.cs

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+using UnityEditor;
+using View;
+
+namespace Editor.Utils {
+  [CustomPropertyDrawer(typeof(Backdrop.Handle))]
+  public class BackdropHandlePropertyDrawer : WrapperPropertyDrawer {
+    protected override string WrappedName => "_backdrop";
+  }
+}

Assets/Editor/Utils/FMODEventInstancePropertyDrawer.cs

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+using Audio;
+using UnityEditor;
+
+namespace Editor.Utils {
+  [CustomPropertyDrawer(typeof(FMODEventInstance))]
+  public class FMODEventInstancePropertyDrawer : WrapperPropertyDrawer {
+    protected override string WrappedName => nameof(FMODEventInstance.Event);
+  }
+}

Assets/Editor/Utils/WrapperPropertyDrawer.cs

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+using UnityEditor;
+using UnityEngine;
+using Utils;
+
+namespace Editor.Utils {
+  public abstract class WrapperPropertyDrawer : PropertyDrawer {
+    protected virtual string WrappedName { get; }
+
+    public override void OnGUI(
+      Rect position,
+      SerializedProperty property,
+      GUIContent label
+    ) {
+      var wrappedProperty = property.FindPropertyRelative(WrappedName);
+      EditorGUI.PropertyField(position, wrappedProperty, label, true);
+    }
+  }
+}