[FR]: expand koel init to cover more configs

Description

Current koel:init command only does setup for the database, but not other config options (like mail config, search providers, ...). Would be useful (especially since there is no good way to test/validate these right now) to have this ask about those

Additional information

Alternatively setting them from the ui with validation and test options could be useful.

i could probably make a pr later to add this to either if that's wanted