Buttons to have focus event

[pricetula]

Describe the feature in detail (code, mocks, or screenshots encouraged)

Html buttons have focus event fires when an element has received focus. Currently one is not able to listen to on:focus event on a button.
example of on:focus
<button on:focus={handleButtonFocused}>...</button> or event forward the focus event <button on:focus>...</button>

What type of pull request would this be?

Enhancement

Provide relevant links or additional information.

component concerned: https://www.bits-ui.com/docs/components/button
example of focus event in svelte: https://svelte.dev/repl/dbeabf42636545b3a8dc6ebe84c2d98c?version=3.17.3

[huntabyte]

If someone wants to add this to the current version of Bits I'll more than happy merge / release.

[huntabyte]

Closing as fixed in bits-ui@next