[Rust] Optimizations for csv reader

[asfimport]

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

PRs and other links:

• GitHub Pull Request #8781

_{Note: This issue was originally created as ARROW-10747. Please see the migration documentation for further details.}

[asfimport]

Neville Dipale / @nevi-me:
Issue resolved by pull request 8781
#8781