gh-156131: threading: add run() and run_daemon() to start threads easily

[rqndom]

Add

• threading.run(func, /, *args, **kwargs)
• threading.run_daemon(func, /, *args, **kwargs)

to replace the often used recipe of

t = threading.Thread(target=func, args=args, kwargs=kwargs)
t.daemon = True
t.start()

• Issue: Add a threading.run convenience function #156131

[python-cla-bot]

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Documentation build overview

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• library/time-complexity.html

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• faq/design.html
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• library/asyncio-stream.html
• library/asyncio-subprocess.html
• library/asyncio-task.html
• library/curses.html
• library/difflib.html
• library/index.html
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