Add option to skip interaction when using php artisan samlidp:cert

[joelharkes]

We used to use the command php artisan samlidp:cert in a process, that did not have interactivity. The process would hanging because a question was asked.

Added

• samlidp:cert --overwrite option to skip the question to overwrite cert files
• samlidp:cert --subject to add subject name when generating certificates

[upwebdesign]

@joelharkes I like this update. I trust this has been tested with multiple options?

[joelharkes]

let me write some unit tests to this, its better validation. i will add separate PR to add github action to run the unit tests :)