Deprecate Player#boostElytra (#9899)

The Paper method was chosen for deprecation because it was more
restrictive in that it has an isGliding check.

patches/api/0244-Add-sendOpLevel-API.patch

@@ -5,14 +5,14 @@ Subject: [PATCH] Add sendOpLevel API
 
 
 diff --git a/src/main/java/org/bukkit/entity/Player.java b/src/main/java/org/bukkit/entity/Player.java
-index e9df321980d0744a50edf2d5f978340013588803..8a6cab8df1f1947bbdc4d11ba24b982a8483b2cc 100644
+index 36e3f86f463cd7b6bca4c8b63739a06f17d7e28a..a46bc40bf101df46843311684f232b4b5b6f9127 100644
 --- a/src/main/java/org/bukkit/entity/Player.java
 +++ b/src/main/java/org/bukkit/entity/Player.java
-@@ -2893,6 +2893,17 @@ public interface Player extends HumanEntity, Conversable, OfflinePlayer, PluginM
-      */
-     @Nullable
-     Firework boostElytra(@NotNull ItemStack firework);
-+
+@@ -2900,6 +2900,19 @@ public interface Player extends HumanEntity, Conversable, OfflinePlayer, PluginM
+     }
+     // Paper end
+ 
++    // Paper start - sendOpLevel API
 +    /**
 +     * Send a packet to the player indicating its operator status level.
 +     * <p>
@@ -23,6 +23,8 @@ index e9df321980d0744a50edf2d5f978340013588803..8a6cab8df1f1947bbdc4d11ba24b982a
 +     * @throws IllegalArgumentException If the level is negative or greater than {@code 4} (i.e. not within {@code [0, 4]}).
 +     */
 +    void sendOpLevel(byte level);
-     // Paper end
- 
++    // Paper end - sendOpLevel API
++
      // Spigot start
+     public class Spigot extends Entity.Spigot {
+