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Eduardo PonceDavid Li
5897217ec5e
Eduardo Ponce authored and David Li committed 0ead7c906da
ARROW-12712: [C++] String repeat kernel

This PR adds the string repeat compute function named "string_repeat". String repeat is a binary function that accepts Binary/StringType(s) and the repetition value(s). Repetition values can be:
* a single value applied to all strings
* an array of values where each repeat count corresponds to the string in the same position

To support inputs of different shapes for this kernel, kernel exec generators and base classes for binary string transforms are also included.

Closes #11023 from edponce/ARROW-12712-String-repeat-kernel

Authored-by: Eduardo Ponce <edponce00@gmail.com>
Signed-off-by: David Li <li.davidm96@gmail.com>