Add ServerWorld#dragonFightBossBar()

Author: MrHell228

src/main/java/org/spongepowered/api/world/server/ServerWorld.java

@@ -24,6 +24,7 @@
  */
 package org.spongepowered.api.world.server;
 
+import net.kyori.adventure.bossbar.BossBar;
 import org.spongepowered.api.ResourceKey;
 import org.spongepowered.api.Server;
 import org.spongepowered.api.block.BlockSnapshot;
@@ -243,6 +244,13 @@ default boolean restoreSnapshot(final Vector3i position, final BlockSnapshot sna
      */
     Optional<Raid> raidAt(Vector3i blockPosition);
 
+    /**
+     * Gets the {@link BossBar} of the ender dragon fight occurring in this {@link ServerWorld}.
+     *
+     * @return The dragon fight boss bar, if present
+     */
+    Optional<BossBar> dragonFightBossBar();
+
     /**
      * Gets the {@link ChunkManager} for this world.
      *