core@3.0.0

Note: The 3.0.0 release contains some breaking changes. Please read the upgrade guide on how to upgrade your application to this version.

• Added namespace to run and scheduler.
• Added PHP 8.3 support
• Added ProxyMiddleware to configure request proxies
• Added ResponseReceiving and ResponseReceived events
• Allow request middleware to set a response to bypass downloader
• Fixed bug where integration tests wouldn't get run