SuspendingTabCompleter missing default support

[Yomanz]

The SuspendingTabCompleter doesn't have the same level of support as the regular TabCompleter provided in Paper.

You can return null to the TabCompleter to allow it to fall back to the default command executor but the signature for SuspendingTabCompleter.onTabComplete is:

suspend fun onTabComplete(
       sender: CommandSender,
       command: Command,
       alias: String,
       args: Array<out String>
   ): List<String>

compared to TabCompleter.onTabComplete

@Nullable
public List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, @NotNull String[] args);

[Shynixn]

That's true, thanks for reporting this.
Hm... the only problem is that simply changing this is a breaking change for existing plugins using this feature. I may even need to do a major version change.

[Yomanz]

Thanks for sorting this so quickly :)