Added Unix Sockets support

[francis-clairicia]

What's changed

High-level API

• Added UnixStreamClient and AsyncUnixStreamClient.
• Added UnixDatagramClient and AsyncUnixDatagramClient.
• Added StandaloneUnixStreamServer and AsyncUnixStreamServer.
• Added StandaloneUnixDatagramServer and AsyncUnixDatagramServer.
• Added UNIXClientAttribute typed attribute set.

Low-level API

• In easynetwork.lowlevel.socket:
  • Added UNIXSocketAttribute.
  • Added UnixCredentials.
  • Added UnixSocketAddress.
• In easynetwork.lowlevel.api_async.backend:
  • Added UNIX transports factory in AsyncBackend interface.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (a374c9d) to head (3c06a98).
Report is 1 commits behind head on main.

Additional details and impacted files

Flag	Coverage Δ
OS-FreeBSD	78.20% <80.51%> (+0.11%)	⬆️
OS-Linux	81.26% <81.61%> (-0.25%)	⬇️
OS-NetBSD	78.18% <80.46%> (+0.05%)	⬆️
OS-OpenBSD	78.18% <80.51%> (+0.12%)	⬆️
OS-Windows	74.12% <44.03%> (-7.12%)	⬇️
OS-macOS	81.13% <81.26%> (-0.35%)	⬇️
Py-3.11	82.24% <84.95%> (+0.31%)	⬆️
Py-3.12	82.00% <83.57%> (+0.06%)	⬆️
Py-3.13	82.00% <83.57%> (+0.04%)	⬆️
test-functional	82.25% <84.95%> (+0.29%)	⬆️
test-unit	90.11% <88.81%> (+0.78%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.