[3.7] bpo-35380: Enable TCP_NODELAY for proactor event loop (GH-10867) (GH-10872)

* bpo-35380: Enable TCP_NODELAY for proactor event loop (GH-10867)
(cherry picked from commit 3bc0ebab17bf5a2c29d2214743c82034f82e6573)

Co-authored-by: Andrew Svetlov <andrew.svetlov@gmail.com>
6 files changed