Update launchProjectile API (#11300)

patches/api/0483-Leashable-API.patch

@@ -0,0 +1,74 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Lulu13022002 <41980282+Lulu13022002@users.noreply.github.com>
+Date: Sat, 22 Jun 2024 21:11:58 +0200
+Subject: [PATCH] Leashable API
+
+
+diff --git a/src/main/java/io/papermc/paper/entity/Leashable.java b/src/main/java/io/papermc/paper/entity/Leashable.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..7402bab20db0ebcac5b2d492ad002ecf9669caad
+--- /dev/null
++++ b/src/main/java/io/papermc/paper/entity/Leashable.java
+@@ -0,0 +1,36 @@
++package io.papermc.paper.entity;
++
++import org.bukkit.entity.Entity;
++import org.checkerframework.checker.nullness.qual.NonNull;
++import org.checkerframework.checker.nullness.qual.Nullable;
++
++/**
++ * Represents an entity that can be leashed.
++ */
++public interface Leashable extends Entity {
++
++    /**
++     * Returns whether the entity is currently leashed.
++     *
++     * @return whether the entity is leashed
++     */
++    boolean isLeashed();
++
++    /**
++     * Gets the entity that is currently leading this entity.
++     *
++     * @return the entity holding the leash
++     * @throws IllegalStateException if not currently leashed
++     */
++    @NonNull Entity getLeashHolder() throws IllegalStateException;
++
++    /**
++     * Sets the leash on this entity to be held by the supplied entity.
++     * <p>
++     * This method has no effect on players.
++     *
++     * @param holder the entity to leash this entity to, or {@code null} to unleash
++     * @return whether the operation was successful
++     */
++    boolean setLeashHolder(@Nullable Entity holder);
++}
+diff --git a/src/main/java/org/bukkit/entity/Boat.java b/src/main/java/org/bukkit/entity/Boat.java
+index 2ac685fb1817f3ce06ebe6391cc863712d68367c..d80524fe32672a8b8940d1028abf22026dace8d2 100644
+--- a/src/main/java/org/bukkit/entity/Boat.java
++++ b/src/main/java/org/bukkit/entity/Boat.java
+@@ -7,7 +7,7 @@ import org.jetbrains.annotations.NotNull;
+ /**
+  * Represents a boat entity.
+  */
+-public interface Boat extends Vehicle {
++public interface Boat extends Vehicle, io.papermc.paper.entity.Leashable { // Paper - Leashable API
+ 
+     /**
+      * Gets the wood type of the boat.
+diff --git a/src/main/java/org/bukkit/entity/Mob.java b/src/main/java/org/bukkit/entity/Mob.java
+index 256e5645bcfa76e7ede58ae365e69b4a4bed6204..9a10262a952e330f42187d6e4edab5a225bfba62 100644
+--- a/src/main/java/org/bukkit/entity/Mob.java
++++ b/src/main/java/org/bukkit/entity/Mob.java
+@@ -8,7 +8,7 @@ import org.jetbrains.annotations.Nullable;
+ /**
+  * Represents a Mob. Mobs are living entities with simple AI.
+  */
+-public interface Mob extends LivingEntity, Lootable {
++public interface Mob extends LivingEntity, Lootable, io.papermc.paper.entity.Leashable { // Paper - Leashable API
+ 
+     // Paper start
+     @Override