Added PlayerToggleSprint event and sprinting related API.

By: Rigby <rigby@onarandombox.com>

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

@@ -98,6 +98,20 @@ public interface Player extends HumanEntity, CommandSender, OfflinePlayer {
      */
     public void setSneaking(boolean sneak);
 
+    /**
+     * Gets whether the player is sprinting or not.
+     *
+     * @return true if player is sprinting.
+     */
+    public boolean isSprinting();
+
+    /**
+     * Sets whether the player is sprinting or not.
+     *
+     * @param sprinting true if the player should be sprinting
+     */
+    public void setSprinting(boolean sprinting);
+
     /**
      * Saves the players current location, health, inventory, motion, and other information into the username.dat file, in the world/player folder
      */
@@ -298,6 +312,7 @@ public interface Player extends HumanEntity, CommandSender, OfflinePlayer {
      *
      * @return Current experience points
      */
+
     public int getExperience();
 
     /**