[OUDS][Components] Create component Assistant Button

[vprothais]

Description

Implement the AI Button available as a WIP in Figma

Design guidelines

The component is available in Figma as a WIP component.
Design tokens are not available for now, they should be present in the next token release.
Until then, we need to create the semantic component design token ourselves based on the raw tokens.

Note

AI button is not a different type of Button in Figma but for now we will consider it as a type of button in our documentation. We'll see later if the AI Button should become an autonomous component and if an AI category with new menu entries is needed.