[ENHANCEMENTS] Staging ACME Provider

[Sickjuicy]

Is your feature request related to a problem? Please describe. It would be good for people who want to test something to use the staging server, because you can quickly reach the limit.

I noticed it when I tried to get Zoraxy to run on my site but it used the wrong DNS servers.

Describe the solution you'd like Simply add the staging servers to the providers

Describe alternatives you've considered A Button maybe?

[Sickjuicy]

Hey I will start looking into it in the next 2 weeks, if @tobychui that's okey with you.

[tobychui]

@Sickjuicy Yeah feel free to do so. This is an open source project.