[php-src] Issue #8013: io_uring for stream_copy_to_stream

Issue: https://github.com/php/php-src/issues/8013 Author: tsukasagenesis ### Description Hello, It would be really nice to implement io_uring like here https://lwn.net/Articles/879724/ to get stream_copy_to_stream() really performant. It would help a lot of stream proxy in php to be handled directly in the kernel, and increase drastically the performance. From many test, stream_copy_to_stream() is sadly "slow" because it didn't use any trick, like send() or 0copy, but instead is just a warper for a classic read/write loop, no gain in performance.