add summoner api to copper golem

purpur-api/paper-patches/files/src/main/java/org/bukkit/entity/CopperGolem.java.patch

@@ -0,0 +1,22 @@
+--- a/src/main/java/org/bukkit/entity/CopperGolem.java
++++ b/src/main/java/org/bukkit/entity/CopperGolem.java
+@@ -3,4 +_,19 @@
+ import io.papermc.paper.entity.Shearable;
+ 
+ public interface CopperGolem extends Golem, Shearable {
++    // Purpur start
++    /**
++     * Get the player that summoned this iron golem
++     *
++     * @return UUID of summoner
++     */
++    @org.jetbrains.annotations.Nullable java.util.UUID getSummoner();
++
++    /**
++     * Set the player that summoned this iron golem
++     *
++     * @param summoner UUID of summoner
++     */
++    void setSummoner(@org.jetbrains.annotations.Nullable java.util.UUID summoner);
++    // Purpur end
+ }