[C++] Add bounds checking to DataType::field() to return nullptr for out-of-bounds access
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Component: C++
Type: enhancement
- Dominant language
- C++
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Description
### Describe the enhancement requested
https://github.com/apache/arrow/blob/15b74944d39656d148c8ef9b100c42427aa40712/cpp/src/arrow/type_test.cc#L2033
### Component(s)
C++
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