Add Horse Animation API (#5599)

patches/api/0319-Missing-Entity-Behavior-API.patch

@@ -4,6 +4,65 @@ Date: Fri, 28 May 2021 21:06:59 -0400
 Subject: [PATCH] Missing Entity Behavior API
 
 
+diff --git a/src/main/java/org/bukkit/entity/AbstractHorse.java b/src/main/java/org/bukkit/entity/AbstractHorse.java
+index 2bbf1d074b7d46e176f2589db7abe5e3ef47871c..e023ed37963177e35bfe78105768ca6b2af6c2a1 100644
+--- a/src/main/java/org/bukkit/entity/AbstractHorse.java
++++ b/src/main/java/org/bukkit/entity/AbstractHorse.java
+@@ -105,4 +105,54 @@ public interface AbstractHorse extends Vehicle, InventoryHolder, Tameable {
+     @NotNull
+     @Override
+     public AbstractHorseInventory getInventory();
++
++    // Paper start - Horse API
++    /**
++     * Gets if a horse is in their eating grass animation.
++     *
++     * @return eating grass animation is active
++     */
++    public boolean isEatingGrass();
++
++    /**
++     * Sets if a horse is in their eating grass animation.
++     *
++     * <p>When true, the horse will lower its neck.</p>
++     *
++     * @param eating eating grass animation is active
++     */
++    public void setEatingGrass(boolean eating);
++
++    /**
++     * Gets if a horse is in their rearing animation.
++     *
++     * @return rearing animation is active
++     */
++    public boolean isRearing();
++
++    /**
++     * Sets if a horse is in their rearing animation.
++     *
++     * <p>When true, the horse will stand on its hind legs.</p>
++     *
++     * @param rearing rearing animation is active
++     */
++    public void setRearing(boolean rearing);
++
++    /**
++     * Gets if a horse is in their eating animation.
++     *
++     * @return eating animation is active
++     */
++    public boolean isEating();
++
++    /**
++     * Sets if a horse is in their eating animation.
++     *
++     * <p>When true, the horse will bob its head.</p>
++     *
++     * @param eating eating animation is active
++     */
++    public void setEating(boolean eating);
++    // Paper end - Horse API
+ }
 diff --git a/src/main/java/org/bukkit/entity/Cat.java b/src/main/java/org/bukkit/entity/Cat.java
 index c2a566b864c82ffb094b7334d9e6e25a1bfc87d1..c340fecb61bac66baf0f44189d21bc85289b1269 100644
 --- a/src/main/java/org/bukkit/entity/Cat.java