[issue37689] Add Path.is_relative_to()

[hai shi]

hai shi <shihai1991 at 126.com> added the comment:

Hi, Antoine, pls review this PR if you have free time.
Looks is_relative_to only catch valueError is good enough.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37689>
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