Migrate content types into repo

[rygine]

Summary

This PR brings in the content types from xmtp-js-content-types, preserving git history. This is part of the effort to centralize all JavaScript related code into a single repository.

Other notable changes:

• The single experimental content type is not included in this migration
• Format checking via prettier has been refactored to centralize config and dependencies
  • The JS SDK and MLS client are now using the official web prettier config
• Some dev dependencies were upgraded
• Added GitHub workflow for content types
• Added upload-service to docker-compose.yml for remote attachment tests

Notes

Once this merges, the xmtp-js-content-types repo will be archived and a link pointing to this repo will be added to the root README.

The NPM token used for publishing will also need an update to include the content type packages.

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Latest commit: 814a45d

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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