[issue22458] Add fractions benchmark

[STINNER Victor]

STINNER Victor added the comment:

> I think string conversion should be part of this benchmark, or it should be renamed to fraction-arith or something.

The "telco" benchmark seems to be standard and well defined. I agree
that we should use a different name.

 > That said, is the purpose of this benchmark to show that fractions
are slow and generate interest in changing the situation?

I'm not really convinced that the benchmark is useful in the Python
benchmark suite, but I'm not strongly opposed to adding it neither :-)

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