This will drastically simplify exposing new functions to R users

Reporter: Wes McKinney / @wesm
Assignee: Neal Richardson / @nealrichardson

Related issues:

• [C++] C++ array kernels framework and execution buildout (umbrella issue) (is a child of)
• [R] Add bindings for sum and mean compute kernels (relates to)
• [R] Add bindings for compare and boolean kernels (relates to)

PRs and other links:

• GitHub Pull Request #7279

_{Note: This issue was originally created as ARROW-8938. Please see the migration documentation for further details.}