Update to Minecraft 1.17

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

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

@@ -0,0 +1,69 @@
+package org.bukkit.entity;
+
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * An Axolotl.
+ */
+public interface Axolotl extends Animals {
+
+    /**
+     * Gets if this axolotl is playing dead.
+     *
+     * An axolotl may play dead when it is damaged underwater.
+     *
+     * @return playing dead status
+     */
+    boolean isPlayingDead();
+
+    /**
+     * Sets if this axolotl is playing dead.
+     *
+     * An axolotl may play dead when it is damaged underwater.
+     *
+     * @param playingDead playing dead status
+     */
+    void setPlayingDead(boolean playingDead);
+
+    /**
+     * Get the variant of this axolotl.
+     *
+     * @return axolotl variant
+     */
+    @NotNull
+    Variant getVariant();
+
+    /**
+     * Set the variant of this axolotl.
+     *
+     * @param variant axolotl variant
+     */
+    void setVariant(@NotNull Variant variant);
+
+    /**
+     * Represents the variant of a axolotl - ie its color.
+     */
+    public enum Variant {
+
+        /**
+         * Leucistic (pink) axolotl.
+         */
+        LUCY,
+        /**
+         * Brown axolotl.
+         */
+        WILD,
+        /**
+         * Gold axolotl.
+         */
+        GOLD,
+        /**
+         * Cyan axolotl.
+         */
+        CYAN,
+        /**
+         * Blue axolotl.
+         */
+        BLUE;
+    }
+}