[C++] Implement hash_aggregate kernels (umbrella issue)

[asfimport]

Umbrella issue to track implementation of hash aggregate kernels.

Reporter: David Li / @lidavidm

Related issues:

• [C++] String concatenate aggregate kernel (is a parent of)
• [C++] Implement hash_aggregate exact quantile kernel (is a parent of)
• [C++] Implement hash_aggregate mode kernel (is a parent of)
• [C++][Compute] Implement count_distinct/distinct hash aggregate kernels (is a parent of)
• [C++] Implement hash_aggregate mean/stdev/variance kernels (is a parent of)
• [C++] Implement hash_aggregate any/all Boolean kernels (is a parent of)
• [C++][Documentation] List hash aggregate kernels somewhere (is a parent of)
• [C++] Implement hash_aggregate approximate quantile kernel (is a parent of)
• [C++] Add 'count all' option to count (hash) aggregate kernel (is a parent of)
• [C++] Implement product aggregate & hash aggregate kernels (is a parent of)
• [C++] C++ array kernels framework and execution buildout (umbrella issue) (is a child of)

_{Note: This issue was originally created as ARROW-13339. Please see the migration documentation for further details.}

[github-actions]

This issue has been marked as stale because it has had no activity in the past 365 days. Please remove the stale label or comment below, or this issue will be closed in 14 days. If this improvement is still desired but has no current owner, please add the 'Status: needs champion' label.