[issue40148] Add PurePath.with_stem()

[Qi Yao]

Qi Yao <tinyaoqi at gmail.com> added the comment:

In Pathlib, we have functions "with_name()""with_stem()""with_suffix()" to modify the file name in the path.

In issue21798:"Allow adding Path or str to Path", it actually also want to modify the file name, that is "appand string to file name".

if with_stem() more cumbersome as:
path.with_name(path.stem + '_v2' + path.suffix)

why not have a function with_xxxx() more cumbersome as:
path.with_name(path.name + "_name.dat")

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nosy: +tinyaoqi

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40148>
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