Release checklist: v0.4.6

[github-actions]

This is a checklist to track the release of v0.4.6.

Core build (this repo):

• GitHub Release
• Android aar released on Maven Central
• Cocoapod released

SQLite + powersync bundles:

• react-native-quick-sqlite: Update core extension to 0.4.6 react-native-quick-sqlite#94
• wa-sqlite build: Update core extension to 0.4.6 wa-sqlite#49
• sql.js dev adapter: Update core extension to 0.4.6 powersync-sql-js#12

User-facing SDK updates:

• powersync.dart: Update core extension to 0.4.6 powersync.dart#327
• powersync-js: Update core extension to 0.4.6 powersync-js#720
• kotlin: Update PowerSync core extension powersync-kotlin#259
• swift: Update Kotlin and core extension powersync-swift#79