New component: Confirmation Modal

[corykon]

Confirmation modals are super common in our apps. We already have generic modals, but we should set up a standard component specifically for this use case to make sure the confirmation experience is aligned.

Leading Wisely just made a nice confirmation modal component that we could port over:

[corykon]

@andrew-frueh thoughts on the styles? Wondering if the spacing/sizing could be dialed in. Some cashmere and non-cashmere variations

On this one - don't like that the buttons are both blue, but love how minimalist it is. Rather than header and a message, sometimes just a one liner and the action buttons are enough.

[corykon]

Note:

• Option to have no header
• Double check styles work well for small screens

[andrew-frueh]

@corykon - if you end up building this one, make sure to include the FocusTrap enhancements/options just added to modal in #1747

[corykon]

Picking this up to work on now, for a CDP use case.