Revamp supabase/config.toml definitions

[sweatybridge]

Is your feature request related to a problem? Please describe. relates to https://github.com/supabase/cli/issues/2536#issuecomment-2247071407

Prompting users to configure the services they need on init would set expectations on how long they need to wait for images to download on running supabase start.

Describe the solution you'd like

1. Use go-playground/validator for field validations
2. Eject config object instead of template substitution
3. Prompt to enable services during supabase init
4. Unify config.toml with viper flag and cli arg

Describe alternatives you've considered A clear and concise description of any alternative solutions or features you've considered.

Additional context Add any other context or screenshots about the feature request here.