[C++] Change the C Type of HalfFloatType
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Component: C++
Type: enhancement
- Dominant language
- C++
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Description
### Describe the enhancement requested
As noted [here](https://github.com/apache/arrow/issues/49179#issuecomment-3882955663), updating the underlying C type of HalfFloatType is required to enable further improvements.
### Component(s)
C++
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