ARROW-10557: [C++] Add scalar string slicing/substring extract kernel#9000

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ARROW-9128: [C++] Implement string space trimming kernels: trim, ltrim, and rtrim

maartenbreddels
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pitrou
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ARROW-10557: [C++] Add scalar string slicing/substring kernel

maartenbreddels
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pitrou
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Address review comments, try to guess an upper bound of output size
pitrou
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