[Button] Add ability for tooltip on disabled buttons

[jpzwarte]

Provide a general summary of the issue here

There are certain scenarios where you want a disabled button to have a tooltip explaining why it is disabled.

Solution: make <sl-button aria-disabled="true"> visually disabled and prevent any actions

👤 Your name

Jeroen

🧢 Your Product/Team

SLDS

[Diaan]

Also update the documentation on the difference between disabled and aria-disabled here https://sanomalearning.design/categories/components/button/accessibility/#wai-aria