[C++] Add support for SnappyConfig.cmake

[asfimport]

Reporter: Kouhei Sutou / @kou
Assignee: Kouhei Sutou / @kou

Related issues:

• [Packaging] Add support for Coan C/C++ package manager (is related to)

PRs and other links:

• GitHub Pull Request #13536

_{Note: This issue was originally created as ARROW-16999. Please see the migration documentation for further details.}

[asfimport]

Kouhei Sutou / @kou:
Issue resolved by pull request 13536
#13536