Speed up socket.errorTab and lazy import selectors #121423
Description
Feature or enhancement
>python -m timeit -n 1000 -s "import socket" "print(socket.__all__)"
1000 loops, best of 5: 407 usec per loop
>python -m timeit -n 1000 -s "import socket" "print(socket.__all__)"
1000 loops, best of 5: 352 usec per loop
1.15x faster