[C++] Implement mod compute function

[asfimport]

Add modulo compute function.

Reporter: Eduardo Ponce / @edponce
Assignee: Eduardo Ponce / @edponce

Related issues:

• [C++] Arithmetic kernels for numeric arrays (is a child of)
• [C++][Compute] Add quotient and modulo kernels (duplicates)
• [C++][Compute] Add floor, ceiling, and truncate kernels (is related to)

_{Note: This issue was originally created as ARROW-13416. Please see the migration documentation for further details.}

[asfimport]

Eduardo Ponce / @edponce:
This issue is already being resolve in https://issues.apache.org/jira/browse/ARROW-12755