Add Entity#isTrackedBy (#12332)

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

@@ -698,6 +698,15 @@ public interface Entity extends Metadatable, CommandSender, Nameable, Persistent
     @NotNull
     Set<Player> getTrackedBy();
 
+    /**
+     * Checks to see if a player is currently tracking this entity.
+     *
+     * @param player the player to check
+     * @return if the player is currently tracking this entity
+     * @see #getTrackedBy()
+     */
+    boolean isTrackedBy(@NotNull Player player);
+
     /**
      * Sets whether the entity has a team colored (default: white) glow.
      *