#787: Add LivingEntity#canBreatheUnderwater()

By: Parker Hawke <hawkeboyz2@hotmail.com>

paper-api/src/main/java/org/bukkit/entity/LivingEntity.java

@@ -588,6 +588,14 @@ public interface LivingEntity extends Attributable, Damageable, ProjectileSource
      */
     <T> void setMemory(@NotNull MemoryKey<T> memoryKey, @Nullable T memoryValue);
 
+    /**
+     * Returns true if this entity can breathe underwater and will not take
+     * suffocation damage when its air supply reaches zero.
+     *
+     * @return <code>true</code> if the entity can breathe underwater
+     */
+    public boolean canBreatheUnderwater();
+
     /**
      * Get the category to which this entity belongs.
      *