feat: Implement basic auth for applications

[pascal-klesse]

I implemented basic auth handling for applications.

Thank you for the great work on this project. Would be happy if my feature will be reviewed and merged.

[vincnt28]

👍🏽 +1

[icrotz]

Highly usefull feature, could also be cool to add Application Auth only on Preview Apps to prevent unwanted usage of that apps

+1

[andrasbacsai]

Thanks, I've did a few modifications but looks good!