[FEATURE]: Advanced Settings Addition: HTTP Basic Auth

[BlockyBlockling]

Hey there,
I decided to switch to Checkmate recently and am now creating a bunch of Feature request of stuff I'm missing/liked to have.

Is your feature request related to a problem? Please describe.
I'd love to have a HTTP Basic Auth implementation on the Checks. It's hopefully fairly simple to implement.
Extremely useful when services are behind an extra auth layer that is not dependent in activity from the actual service.

Describe the solution you'd like
Having an extendable option in the Advanced Settings where you can Specify a HTTP Basic Auth Username and Password that the check uses when checking.

Additional context
I was trying to implement it myself but I'm not familiar with REACT and your system so help would be appreciated.

Thanks for your help and feel free to take a look at my other Issues!
#3032, #3034, #3035

[cinhtau]

Not the same, but usually auth could be passed in the URL #2966. This approach is much more user friendly and clean.