Feature Request

• Yes, I reviewed the contribution guidelines.

Describe your use case and the problem you are facing

I want to load Xdebug module into the web server via php -S -dzend_extension=xdebug.so.

Describe the solution you'd like

wp server could pass through additional arguments to php after -- argument.

Example: wp server --docroot=public -- -dzend_extension=xdebug.so

Doing this via wp server --config argument is problematic, because I want to define universally usable commands centrally in composer.json scripts. Due to variety of INI configuration file locations on user's system, which we actually don't want to replace, this doesn't seem to be achievable with a single --config argument.