chore: add changesets config

[connorlindsey]

Adds changesets CLI, release command, and release GitHub action.

Internal documentation here: https://www.notion.so/knockapp/How-to-release-JavaScript-packages-2f6fbfe72f204d3fb5cb479ce93cf98b

[linear[bot]]

KNO-4821 Set up release process for JS monorepo

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 474abaa4c469a3bad3ea95f524571accbe826c78

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

This PR includes changesets to release 6 packages

| Name | Type | | ---------------------------- | ----- | | @knocklabs/eslint-config | Patch | | @knocklabs/react | Patch | | @knocklabs/react-core | Patch | | @knocklabs/react-native | Patch | | @knocklabs/typescript-config | Patch | | nextjs-example | Patch |

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR