Possibility to customize button color and logo

### Description

I would like the possibility to change the color of any button component, both primary and secondary color as it would make it easier to make customized button, and more suitable for different types of actions and use cases. I would also like the possibility to add a small icon.

### Additional Information

Screenshot of how a custom button looks today, with the only modification being if it is a "primary" or "secondary" button:
Screenshot of wanted look of button:
Maybe by adding a style attribute to buttons, which is not mandatory but can change into different values.

No source files or tests are named. Start by locating the button components and their current primary/secondary styling, then compare the existing and requested screenshots. Done should mean buttons support the requested optional color customization and small icon while preserving existing button behavior.

Written by the indexing model from the issue text.