[Feature Request] Override System Dark mode setting

[evolighting]

Alacritty supports configuring dark mode, which provides a more consistent experience on Windows. An example configuration is as follows:
decorations_theme_variant

[decorations_theme_variant] = "Dark" | "Light" | "None"
Override the variant of the System theme/GTK theme/Wayland client side decorations. Set this to "None" to use the system's default theme variant.
Default: "None"

toml file:

[window]
decorations = "Full"
decorations_theme_variant = "Dark"

It would be great if this feature were supported.

[evolighting]

#1274
try to make it work