Enhance: add domain configuration

[lakuapik]

Currently we do not support domain in api config, would be nice to have.

[lakuapik]

@axmad386 would you mind help us do this? haha

[axmad386]

@lakuapik I don't get it. How custom domains are needed in this package. It's kodepandai/laravel-indonesia. Did you mean to add this issue to kodepandai/laravel-api-response?

[lakuapik]

currently we have an open api, can be configured here https://github.com/kodepandai/laravel-indonesia/blob/master/config/indonesia.php, it would be nice if we have on option to set domain name since we can configure the path and prefix.

https://laravel.test => main website
https://api.laravel.test/api/indonesia => api endpoint