feat: switch to date-fns intlFormatDistance to reduce bundle size

[connorlindsey]

Switches from formatDistance to intlFormatDistance which uses the built-in browser Intl object for formatting relative times: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/RelativeTimeFormat/RelativeTimeFormat#browser_compatibility

This should greatly reduce the bundle size.

Fixes #18

TODO:

• [x] Update relevant docs / readmes
• [x] Double check package size. I built it locally and ran npm pack but want to double check the difference

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 142d363a711191b3b8c1c9c8de5f72efd8fba43f

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

| Name | Type | | --------------------- | ----- | | @knocklabs/react-core | Patch | | @knocklabs/react | Patch |

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