[Doc][Flight] Mention Flight SQL in implementation status

[asfimport]

It seems Flight SQL should probably be present in a way in the implementation status page:
https://arrow.apache.org/docs/dev/status.html#flight-rpc

Reporter: Antoine Pitrou / @pitrou
Assignee: David Li / @lidavidm

Related issues:

• [Doc] Add Flight SQL to implementation status page (supercedes)

PRs and other links:

• GitHub Pull Request #14053

_{Note: This issue was originally created as ARROW-16384. Please see the migration documentation for further details.}

[asfimport]

Antoine Pitrou / @pitrou:
@lidavidm

[asfimport]

David Li / @lidavidm:
Yes, that would make sense to have. Also cc @jduo. It might also be nice to have a table of implementations (possibly under the "Powered By" page on the website?)

[asfimport]

David Li / @lidavidm:
Issue resolved by pull request 14053
#14053