[Rust][DataFusion] Change flight server example to use DataFrame API

[asfimport]

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

PRs and other links:

• GitHub Pull Request #9645

_{Note: This issue was originally created as ARROW-11894. Please see the migration documentation for further details.}

[asfimport]

Andrew Lamb / @alamb:
Issue resolved by pull request 9645
#9645