More abilities, refactor IPokemon.SetStatus to pass pokemon that caused the status change

Plugins/PkmnLib.Plugin.Gen7/Scripts/Abilities/Symbiosis.cs

@@ -0,0 +1,12 @@
+namespace PkmnLib.Plugin.Gen7.Scripts.Abilities;
+
+/// <summary>
+/// Symbiosis is an ability that passes the user's held item to an ally if the ally consumes its own held item.
+///
+/// <see href="https://bulbapedia.bulbagarden.net/wiki/Symbiosis_(Ability)">Bulbapedia - Symbiosis</see>
+/// </summary>
+[Script(ScriptCategory.Ability, "symbiosis")]
+public class Symbiosis : Script
+{
+    // TODO: Implement Symbiosis ability logic
+}