ARROW-9079: [C++] Write benchmark for arithmetic kernels#7417

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kszucs:ARROW-9079

Commits on Jun 12, 2020

Add benchmark

kszucs
authored and
bkietz
committed
template arithmetic benchmarks on op
bkietz
committed

Commits on Jun 13, 2020

DRY improvements with macro. Do not randomly-generate 20-90M length arrays. Add items processed output
wesm
committed