[I] [C++] Add missing scalar arithmetic function: expm1() [arrow]

[via GitHub]

felipecrv opened a new issue, #44903:
URL: https://github.com/apache/arrow/issues/44903

   ### Describe the enhancement requested
   
   Add `Expm1(exponent)` scalar arithmetic function.
   
   `Expm1(exponent)` is a more accurate way of computing `Exp(exponent) - 1.0` 
for small values of `exponent`. Implementations are provided by standard C 
library implementations.
   
   ### Component(s)
   
   C++


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