[issue20218] Add `pathlib.Path.write` and `pathlib.Path.read`

[Antoine Pitrou]

Antoine Pitrou added the comment:

> Which parts of the API merit discussion? The method names? Whether to
> include readlines/writelines? The arguments?

I think the readlines/writelines methods, as well as the size argument,
should be dropped.
Furthermore, there also should be distinct text/binary variants.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20218>
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