[C++] Use std::to_chars instead of std::to_string

[asfimport]

std::to_chars is locale-independent unlike std::to_string; it may also be faster in some cases.

Reporter: Antoine Pitrou / @pitrou
Assignee: Antoine Pitrou / @pitrou

Related issues:

• [C++] Adopt C++17 idioms and features for maintainability (is a child of)

PRs and other links:

• GitHub Pull Request #14666

_{Note: This issue was originally created as ARROW-18350. Please see the migration documentation for further details.}

[asfimport]

Antoine Pitrou / @pitrou:
Issue resolved by pull request 14666
#14666