bpo-45644: json.tool: Use staged write for outfile.

[methane]

To support python -m json.tool --json-lines infile infile.

https://bugs.python.org/issue45644

[CharString]

I don't particularly like it, it assumes write access to more than just inode of the original file. But 🤷 I won't me bikeshedding over this. The implementation reads well, the user facing interface is the same and I expect in 99% of the cases, write access won't be a problem.

[methane]

Windows CI is failing:

Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "D:\a\cpython\cpython\Lib\json\tool.py", line 104, in <module>
    main()
    ^^^^^^
  File "D:\a\cpython\cpython\Lib\json\tool.py", line 94, in main
    with out as outfile:
    ^^^^^^^^^^^^^^^^^^^^
  File "D:\a\cpython\cpython\Lib\contextlib.py", line 144, in __exit__
    next(self.gen)
    ^^^^^^^^^^^^^^
  File "D:\a\cpython\cpython\Lib\json\tool.py", line 35, in _staged_outfile
    os.replace(tempname, path)
    ^^^^^^^^^^^^^^^^^^^^^^^^^^
PermissionError: [WinError 5] Access is denied: 'D:\\a\\cpython\\cpython\\build\\test_python_1644\ufffd\\test_python_worker_5368\ufffd\\@test_5368_tmp\ufffd.1kimt_1s' -> '@test_5368_tmp\ufffd'

It is difficult to write the staged write idiom with few lines of code.

For example: https://github.com/mitsuhiko/python-atomicfile/blob/master/atomicfile.py

I close this PR and wait that Python has this feature in stdlib.