Refactor actions to be entities with components (#19900)

Content.Shared/Magic/Events/ProjectileSpellEvent.cs

@@ -0,0 +1,22 @@
+using Content.Shared.Actions;
+using Robust.Shared.Prototypes;
+using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype;
+
+namespace Content.Shared.Magic.Events;
+
+public sealed partial class ProjectileSpellEvent : WorldTargetActionEvent, ISpeakSpell
+{
+    /// <summary>
+    /// What entity should be spawned.
+    /// </summary>
+    [DataField("prototype", required: true, customTypeSerializer: typeof(PrototypeIdSerializer<EntityPrototype>))]
+    public string Prototype = default!;
+
+    /// <summary>
+    /// Gets the targeted spawn positions; may lead to multiple entities being spawned.
+    /// </summary>
+    [DataField("posData")] public MagicSpawnData Pos = new TargetCasterPos();
+
+    [DataField("speech")]
+    public string? Speech { get; private set; }
+}