add support for io_uring if improves gdu

[daniejstriata]

@dundee Will it be possible to add support for io_uring? And if so won't gdu benefit from modern kernels supporting this?

https://unixism.net/loti/what_is_io_uring.html

This allows for io_uring in go https://github.com/Iceber/iouring-go

[dundee]

Yes, we can check if gdu can benefit from this.

[daniejstriata]

The newer plocate for instance is much faster than the older mlocate.

https://plocate.sesse.net/

[dundee]

I have tried to use io_uring in #195 but it's much slower than the current implementation for now. I will need to spend more time on it.