Add electron example using Node.JS SDK in main process

[simolus3]

This adds a small example using the Node.JS SDK in the main process of an element application. To expose database functionality, we inject get(), watch() and the status stream into renderer processes using IPC channels created in the preload script.

To exercise the new CommonJS compilation of our Node SDK, the new demo uses webpack to compile everything into a CommonJS module. It also sets up the build to:

1. Copy the libpowersync.dylib (or the platform-specific alternative name) into the JavaScript assets for the main process.
2. Creates and starts a custom database worker that loads the native core extensions from their copied location.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 7dbecbe

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.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

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

The base branch was changed.