[C++] Eliminate Array boxing in scalar string kernels
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- C++
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Description
### Describe the enhancement requested
https://github.com/apache/arrow/pull/13364 introduced todos as below:
https://github.com/apache/arrow/blob/53752adc6b81166cd4ee7db5a819494042f29197/cpp/src/arrow/compute/kernels/scalar_string_ascii.cc#L398
https://github.com/apache/arrow/blob/53752adc6b81166cd4ee7db5a819494042f29197/cpp/src/arrow/compute/kernels/scalar_string_ascii.cc#L450
https://github.com/apache/arrow/blob/53752adc6b81166cd4ee7db5a819494042f29197/cpp/src/arrow/compute/kernels/scalar_string_ascii.cc#L2887
https://github.com/apache/arrow/blob/53752adc6b81166cd4ee7db5a819494042f29197/cpp/src/arrow/compute/kernels/scalar_string_ascii.cc#L2916
https://github.com/apache/arrow/blob/53752adc6b81166cd4ee7db5a819494042f29197/cpp/src/arrow/compute/kernels/scalar_string_ascii.cc#L2952
### Component(s)
C++
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