[C++] Add StructScalar to Scalar::Parse()
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Component: C++
Type: enhancement
- Dominant language
- C++
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Description
### Describe the enhancement requested
I find that there is no implementation for `StructScalar` in `Scalar::Parse`. is there any plan for implementation?
https://github.com/apache/arrow/blob/30adc91e740dfbfe1d018169c0f1eb4df0aad4c4/cpp/src/arrow/scalar.cc#L1022-L1043
### Component(s)
C++
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