Update DB schema, add migration

[rygine]

Summary

React SDK

• Upgraded to latest JS SDK
• Updated local DB schema for conversations, messages, consent, and reactions
• Added automatic migration to new DB schema
• Refactored how local DB instances are obtained
• Updated README
• Updated example app components to work with new schema
• Refactored some tests

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: ab6ec41b86dc5a7bd4b13f6bb3eb8b8b082799c9

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

This PR includes changesets to release 1 package

| Name | Type | | --------------- | ----- | | @xmtp/react-sdk | Patch |

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