Set TCP_NODELAY on pydevd client connections

[nightcityblade]

Fixes #2054

Summary

• disable Nagle's algorithm on outbound pydevd client sockets
• tolerate platforms that do not expose or support TCP_NODELAY
• add a focused socket mock test for the new option

Testing

• PYTHONPATH=. python3 -m pytest -q tests_python/test_pydevd_comm.py tests_python/test_fixtures.py (4 passed)
• python3 -m ruff format --check _pydevd_bundle/pydevd_comm.py tests_python/test_pydevd_comm.py
• Ruff lint checks on both changed files

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