GH-48123 [C++][Float16] Reimplement arrow::WithinUlp and Enable it for float16 #48224
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Rationale for this change
Refer to this comment. Additionally, this change enables
arrow::WithinUlpforfloat16.What changes are included in this PR?
Re-implement
arrow::WithinUlpand enable it forfloat16, including relevant tests for corner cases around powers of two andFloat16.Are these changes tested?
Yes, I ran the relevant unit tests.
Are there any user-facing changes?
No.