Trevor Gross c09e58be46 Create interfaces for testing against MPFR
Add a way to call MPFR versions of functions in a predictable way, using
the `MpOp` trait.

Everything new here is guarded by the feature `test-multiprecision`
since MPFR cannot easily build on Windows or any cross compiled targets.
2024-10-28 20:56:11 -05:00
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