create new resource group and bind specific backgroup thread to it

[Liang Cheng]

Hi,
I'd like to try something on resource group.
1. Create new resource group, type system, priority -20
2. bind log_flusher_thread and log_writer_thread to this new resource group

It fails because of following error.
mysql> SET RESOURCE GROUP bg_thread1 FOR 19;
ERROR 3661 (HY000): Unable to bind resource group bg_thread1 with thread id (19).(Failed to apply thread controls.).

I wonder if this operation available on MySQL 8.0.29