Dropdown menu items with icons

[julien-deramond]

Prerequisites

• I have searched for duplicate or closed feature requests
• I have read the contributing guidelines

Proposal

In our documentation, to display the theme selector, we had to modify slightly the rendering in #2237 to:

• force the button's height to 40px
• force the icon size to 20px x 20px

Here an example of the rendering:

It might be the default rendering for icons in dropdowns in Boosted and this could be added in the DSM/UI Kits as well since this dropdown might be used in all websites with light/dark mode management.

Motivation and context

Avoid hacky modifications so that the rendering is always correct.