ARROW-14035: [C++][Python][R] Implement count distinct kernel#11257

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aucahuasi:ARROW-14035-implement-count_distinct-kernel

Commits on Oct 5, 2021

ARROW-14035: Implement count distinct kernel

aucahuasi
authored and
pitrou
committed
Simplify namespaces and function registration
pitrou
committed
Some nits
pitrou
committed