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ARROW-13163: [C++][Gandiva] Implement REPEAT function on Gandiva

 Implement REPEAT function on Gandiva which concatenate a string "n" times.
- REPEAT(str, int)

Closes #10595 from jpedroantunes/feature/add-repeat-function and squashes the following commits:

f279a7455 <João Pedro> Fix lint errors
57506c799 <João Pedro> Add implementation for repeat function

Authored-by: João Pedro <joaop@simbioseventures.com>
Signed-off-by: Praveen <praveen@dremio.com>