[1.0.0] Add a way to close the socket FD without fully calling shutdown.

[ChadSikorra]

I need this in the LDAP library. We need to be able to clean-up the original server socket after forking so we don't cause issues on server shutdown.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.71%. Comparing base (0e43af8) to head (d8679b7).

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #12      +/-   ##
============================================
+ Coverage     81.63%   81.71%   +0.08%     
- Complexity      144      145       +1     
============================================
  Files            10       10              
  Lines           452      454       +2     
============================================
+ Hits            369      371       +2     
  Misses           83       83              

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