Feature request: add a pie config command (Composer-like config management)

[FlorentPoinsaut]

Summary

PIE already supports configuration through pie.json (for example config.secure-http=false), but there is currently no dedicated CLI command to inspect or update configuration values.

It would be very helpful to add a pie config command, similar in spirit to composer config, to make config management easier, safer, and more scriptable.

Related context

Confirmed real-world case: setting config.secure-http to false in pie.json works as expected, but is currently manual.