use Logger from Caddy context

[IndraGunawan]

since FrankenPHPApp module has implemented caddy.Provisioner
using logger from Caddy context gives us clear information if the logs written by FrankenPHPApp module

Before

2025/02/13 08:00:11.443 INFO    FrankenPHP started 🐘   {"php_version": "8.4.5-dev", "num_threads": 20}
2025/02/13 08:02:11.983 INFO    FrankenPHP stopped 🐘

After

2025/02/13 08:03:25.195 INFO    frankenphp      FrankenPHP started 🐘   {"php_version": "8.4.5-dev", "num_threads": 20}
2025/02/13 08:03:51.717 INFO    frankenphp      FrankenPHP stopped 🐘

[dunglas]

Thanks!