Refactor actions to be entities with components (#19900)

Content.Shared/UserInterface/OpenUiActionEvent.cs

@@ -0,0 +1,23 @@
+using Content.Shared.Actions;
+using Robust.Shared.Reflection;
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.UserInterface;
+
+public sealed partial class OpenUiActionEvent : InstantActionEvent, ISerializationHooks
+{
+    [ViewVariables]
+    public Enum? Key { get; private set; }
+
+    [DataField("key", required: true)]
+    private string _keyRaw = default!;
+
+    void ISerializationHooks.AfterDeserialization()
+    {
+        var reflectionManager = IoCManager.Resolve<IReflectionManager>();
+        if (reflectionManager.TryParseEnumReference(_keyRaw, out var key))
+            Key = key;
+        else
+            Logger.Error($"Invalid UI key ({_keyRaw}) in open-UI action");
+    }
+}