Add stream socket keepalive context options #20381
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This adds so_keepalive, tcp_keepidle, tcp_keepintvl and tcp_keepcnt stream socket context options that are used to set their upper case C macro variants by setsockopt function.
The test requires sockets extension and just tests that the values are being set. This is because a real test would be slow and difficult to show that those options really work due to how they work internally.