Add method isTickingWorlds to Bukkit (#8316)

Co-authored-by: Shane Freeder <theboyetronic@gmail.com>

Also, restores un/loading worlds mid tick. This will not be officially supported API contract that such a routine is safe, and these restrictions may be restored in the future.

patches/api/0388-Custom-Chat-Completion-Suggestions-API.patch

@@ -1,36 +0,0 @@
-From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
-From: Owen1212055 <23108066+Owen1212055@users.noreply.github.com>
-Date: Sat, 30 Jul 2022 11:23:11 -0400
-Subject: [PATCH] Custom Chat Completion Suggestions API
-
-
-diff --git a/src/main/java/org/bukkit/entity/Player.java b/src/main/java/org/bukkit/entity/Player.java
-index 8bac7b0b762a75a6535b50351850192a9568b578..cde9dfaba913e18d2efc6003d5209ba3cfb02945 100644
---- a/src/main/java/org/bukkit/entity/Player.java
-+++ b/src/main/java/org/bukkit/entity/Player.java
-@@ -2594,6 +2594,25 @@ public interface Player extends HumanEntity, Conversable, OfflinePlayer, PluginM
-      * @throws IllegalArgumentException If the level is negative or greater than {@code 4} (i.e. not within {@code [0, 4]}).
-      */
-     void sendOpLevel(byte level);
-+
-+    /**
-+     * Adds custom chat completion suggestions that the client will
-+     * suggest when typing in chat.
-+     *
-+     * @param completions custom completions
-+     */
-+    void addAdditionalChatCompletions(@NotNull java.util.Collection<String> completions);
-+
-+    /**
-+     * Removes custom chat completion suggestions that the client
-+     * suggests when typing in chat.
-+     *
-+     * Note: this only applies to previously added custom completions,
-+     * online player names are always suggested and cannot be removed.
-+     *
-+     * @param completions custom completions
-+     */
-+    void removeAdditionalChatCompletions(@NotNull java.util.Collection<String> completions);
-     // Paper end
- 
-     // Spigot start