Add firework api to get and set Firework ItemMeta

src/main/java/org/bukkit/entity/Firework.java

@@ -1,5 +1,19 @@
 package org.bukkit.entity;
 
-public interface Firework extends Entity {
+import org.bukkit.inventory.meta.FireworkMeta;
 
+public interface Firework extends Entity {
+    /**
+     * Get a copy of the fireworks meta
+     *
+     * @return A copy of the current Firework meta
+     */
+    FireworkMeta getFireworkMeta();
+
+    /**
+     * Apply the provided meta to the fireworks
+     *
+     * @param meta The FireworkMeta to apply
+     */
+    void setFireworkMeta(FireworkMeta meta);
 }