Improved server performances and memory consumption on error

[francis-clairicia]

What's changed

• Clear traceback frames saved by transports implemented with asyncio.
• Improved AsyncStreamReadTransport.recv_into() implementation for asyncio transports.
• Fixed byte buffers not deallocated until garbage collection if transport.close() or transport.aclose() raises an exception.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (1956c23) to head (2f685e5).
Report is 2 commits behind head on main.

Additional details and impacted files

Flag	Coverage Δ
OS-FreeBSD	78.08% <74.32%> (+0.09%)	⬆️
OS-Linux	81.50% <77.02%> (+0.08%)	⬆️
OS-Windows	81.24% <74.32%> (+0.08%)	⬆️
OS-macOS	81.48% <74.32%> (+0.08%)	⬆️
Py-3.11	81.92% <77.02%> (+0.08%)	⬆️
Py-3.12	81.93% <77.02%> (+0.08%)	⬆️
Py-3.13	81.96% <77.02%> (+0.08%)	⬆️
test-functional	81.96% <77.02%> (+0.08%)	⬆️
test-unit	89.32% <100.00%> (+<0.01%)	⬆️

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