Servers: Common implementation for both TCP and UDP servers

[francis-clairicia]

Backward-incompatible changes

• Removed get_addresses() from AbstractNetworkServer and AbstractAsyncNetworkServer
• Removed stop_listening() from StandaloneTCPNetworkServer and AsyncTCPNetworkServer
  • server_close() must be used from now on
• server_close() no longer shut down the serve_forever() loop directly like shutdown()

New feature

• Asynchronous servers ONLY :
  • Added server_activate() method to add the possibility to bind and activate listeners before calling serve_forever()
  • Added is_listening() to check if server_activate() has already been called

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (a5671c7) to head (be2fc00).

Additional details and impacted files

Flag	Coverage Δ
OS-Linux	99.89% <100.00%> (-0.01%)	⬇️
OS-Windows	99.78% <99.53%> (-0.01%)	⬇️
OS-macOS	99.89% <100.00%> (-0.01%)	⬇️
Py-3.11	99.89% <100.00%> (-0.01%)	⬇️
Py-3.12	99.94% <100.00%> (-0.01%)	⬇️
test-functional	82.30% <100.00%> (-0.11%)	⬇️
test-unit	89.62% <49.53%> (+0.75%)	⬆️

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