Include frankenphp version in logs

[gucki]

Describe your feature request

On startup, FrankenPHP logs the following:

FrankenPHP started 🐘 {"php_version": "8.2.31", "num_threads": 4, "max_threads": 8, "max_requests": 0}

The startup log should include the FrankenPHP version, consistent with what frankenphp -v reports:

FrankenPHP started 🐘 {"version": "1.12.4", "php_version": "8.2.31", "num_threads": 4, "max_threads": 8, "max_requests": 0}

Optionally, the Caddy version could be included too, mirroring the full version string from frankenphp -v.

[dunglas]

IMHO this should be handled by upstream Caddy. We already modify the Caddy version string in FrankenPHP, so if Caddy logs its own version, this will include FrankenPHP version in FrankenPHP.