Allow Button to accept href attribute

[darleendenno]

Issue: N/A

References: #4667

What I did

While I am strongly against the practice of having links appear as buttons (and vice versa), this PR aims to fix a TypeScript error when trying to use <Button isLink />.

How to test

1. Pull down branch, yarn build --core, yarn start
2. Navigate to Button story
3. Last button is a "ButtonLink" that accepts an href prop

• Is this testable with Jest or Chromatic screenshots? Yep, new story added (see Button stories)
• Does this need a new example in the kitchen sink apps? Nope
• Does this need an update to the documentation? Nope

If your answer is yes to any of these, please make sure to include it in your PR.

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[darleendenno]

This is blocking work for the referenced issue -- if we can approve early next week I would be very happy ❤️

[smithambera]

Code seems good to me, although I fully agree with you about using buttons as links 💯

[MichaelArestad]

This looks good to me. I also have opinions on links disguised as buttons, but generally speaking, there is a time and place for it and we should do it sparingly.

[shilman]

LGTM!