[FEATURE] Contextual button colors

[fynnfeldpausch]

🚀 Feature request

Is your feature request related to a problem?

We are in need of contextual buttons that indicate success or danger.

Describe the solution you'd like

Buttons appearance mode should also support "Success" and "Error" and use the colors already defined in the current colors set.

Additional context

[waterplea]

This can be achieved by custom buttons. Check out the last example:
https://taiga-ui.dev/tui-button#custom

Buttons, like many other components, use tui-wrapper component under the hood. It is responsible for displaying interactive state for different Appearances. You can extend it by adding your custom appearances and defining them in global styles, as shown in example.

I will cover that in Customization guide I plan to add this week.

[fynnfeldpausch]

Perfect, this solves my use case.