mod_client_management: Report on longest lived token when grant does not expire E.g. for mod_http_oauth2 where by default the grant itself is unlimited, while refresh tokens are issued with one week lifetime, but are renewed with each use.

This module produces more detailed HTTP logs for Prosodys built-in HTTP
server. The format is similar to that of Apache and go into Prosodys
normal logs at the `info` level.