Fix icon button disabled state

[johnarban]

Implement a disabled state.

The disabled state can be styled using

.icon-wrapper[aria-disabled=true] {
    // styles
  }

[Carifio24]

Looks good to me. I added a default value for this flag to the Storybook story (and gave that story a bit of styling so that the disabled state is evident).

Only thing I'm wondering about is whether we want the tooltip to still be active when the button is disabled?

[Carifio24]

I really like the cursor style update. I have one question about the tooltip styling - what is the intended color to get for the disabled styling? For me the disabled tooltip now looks like the image below, which is kinda hard to read.