[IMEXRunnerUtils] Update Allclose and printMaxError semantics to handle Nan and inf.

[mshahneo]

Add a new set of APIs to matches NumPy semantics for numpy.allclose and numpy.isclose:

- NaNs at the same index are equal *iff* `equal_nan=True`.
- A NaN paired with any non-NaN is never close.
- Infinities are equal *iff* same sign; `+Inf` vs `-Inf` and `Inf` vs finite are not close.

Instead of updating the existing APIs - which
changes their ABI and forces every integration test call site to update — keep the existing extern "C" symbols at their original signatures using numpy's default equal_nan=True, and expose the equal_nan=False behavior through new Strict symbols:

• allcloseStrict{F16,BF16,F32}
• printAllcloseStrict{F16,BF16,F32}
• printMaxErrorStrict{F16,BF16,F32}

For printMaxErrorStrict, additionally surface NaN/Inf mismatches in the printed report rather than letting them disappear into a silent zero.

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