ARROW-11930: [C++][Dataset][Compute] Use an ExecPlan for dataset scans#10397

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bkietz wants to merge 28 commits intoapache:masterfrom

bkietz:11930-Refactor-Dataset-scans-to

Commits on Jun 30, 2021

Commits on Jul 1, 2021

move hash into Expression::Expression(Call) to ensure it's always initialized
bkietz
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