Add initial AccessibleButton component

[evansjohnson]

Checklist

• Includes tests
• Update documentation

Will add tests if this gets general go ahead nod.

Changes proposed in this pull request:

Add an AccessibleButton utility component to abstract away making a non <button> component properly clickable

Would come in handy for #3079, #4810 (tabIndex={0} won't really help if can't be triggered by keyboard while focused), #4782, and other tickets requiring keyboard support

Reviewers should focus on:

Is this a component Blueprint wants to support?

Is it implemented correctly?

• Also considered if it should be a <button> component that removes all styling, though perhaps less flexible for consumers

AccessibleButtonProps doesn't extend anything right now, had trouble finding something that worked everything seemed to cause some issue. Will fix up if this gets a general go ahead nod.

Screencap

[adidahiya]

we added this to an internal component library; will reconsider adding it to Blueprint after it's had some time to bake there