gh-108277: Add os.timerfd_create() function (#108382)

Add wrapper for timerfd_create, timerfd_settime, and timerfd_gettime to os module.

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>
Co-authored-by: Erlend E. Aasland <erlend.aasland@protonmail.com>
Co-authored-by: Victor Stinner <vstinner@python.org>