Add more entity api (#7564)

patches/api/Turtle-API.patch

@@ -279,5 +279,12 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     * @param hasEgg True if carrying egg
 +     */
 +    void setHasEgg(boolean hasEgg);
++
++    /**
++     * Returns whether the turtle is currently laying an egg.
++     *
++     * @return whether the turtle is laying an egg
++     */
++    boolean isLayingEgg();
 +    // Paper end
 +}