SPIGOT-7850: Add API for Bogged shear state

By: md_5 <git@md-5.net>

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

@@ -5,15 +5,5 @@ import org.bukkit.material.Colorable;
 /**
  * Represents a Sheep.
  */
-public interface Sheep extends Animals, Colorable {
-
-    /**
-     * @return Whether the sheep is sheared.
-     */
-    public boolean isSheared();
-
-    /**
-     * @param flag Whether to shear the sheep
-     */
-    public void setSheared(boolean flag);
+public interface Sheep extends Animals, Colorable, Shearable {
 }