public SocketError.makeFailed()

[swhitty]

make SocketError.makeFailed(...) public so 3rd party extensions can throw SocketError.

As requested in #192

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.39%. Comparing base (4b4e8fc) to head (51190ab).
⚠️ Report is 4 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #196   +/-   ##
=======================================
  Coverage   92.39%   92.39%           
=======================================
  Files          69       69           
  Lines        3536     3536           
=======================================
  Hits         3267     3267           
  Misses        269      269           

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