Backport #27000 by @wxiaoguang
This PR reduces the complexity of the system setting system.
It only needs one line to introduce a new option, and the option can be
used anywhere out-of-box.
It is still high-performant (and more performant) because the config
values are cached in the config system.
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
