Use epoll over io_uring channel for Unix Domain Sockets

[atakavci]

fix for the issue #2790

the current implementation uses io_uring as preferred. the change contains switch of precedence to use epoll over io_uring. I did some reading on the performance comparisons of io_uring and epoll; io_uring is considered faster than epoll in some cases and not in others. -> https://github.com/axboe/liburing/issues/536

Since we are changing default behavior when both of them are available, there will be some performance change for clients that have both in runtime. i cant evaluate exactly how big the impact is and/or how many client will be impacted. happy to hear any comments.

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[mp911de]

Thank you for your contribution. That's merged, polished, and backported now.