GH-46858: [C++] Change HalfFloatScalar::ValueType to Float16 #47519
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Rationale for this change
This should reduce friction when working with half-float scalars since
util::Float16, unlikeuint16_t, mimics the behavior of a native floating point type.What changes are included in this PR?
Changes the type of
HalfFloatScalar::valuetoutil::Float16. Miscellaneous adjustments are made elsewhere as needed.Are these changes tested?
Yes
Are there any user-facing changes?
Yes, the changes to
HalfFloatScalarare breaking.