Accept after-dump and after-load as array for Artisan call.

[paulrrogers]

So one can use config:cache with after-load and after-dump

Manual test steps

1. checkout locally
2. composer require local checkout in other Laravel project
3. change after-load to an array with values that align with Artisan::call() arguments
4. php artisan migrate:dump
5. verify after-load ran the given Artisan command
6. php artisan config:cache
7. verify that "Your configuration files are not serializable" error does not appear