[Rust][DataFusion] Address hash aggregate performance with high number of groups

[asfimport]

Reporter: Daniël Heres / @Dandandan
Assignee: Daniël Heres / @Dandandan

PRs and other links:

• GitHub Pull Request #9234

_{Note: This issue was originally created as ARROW-11290. Please see the migration documentation for further details.}

[asfimport]

Andrew Lamb / @alamb:
Issue resolved by pull request 9234
#9234