[FEATURE] Brightness supports external monitors similar to KDEs implemenation

[mystery2310]

Is your feature request related to a problem? Please describe.

No response

Describe the solution you'd like

I would like to be able to change my external monitors brightness through the brightness slider in the waybar

Describe alternatives you've considered

No response

Additional context

No response

Support or Contribution

• I am willing to contribute or support this feature