4.0.0

This is a new major release, that uses and requires a new major version of sentry/sentry, specifically with a ^3.0 constraint.
To upgrade your app, read through the UPGRADE-4.0.md document of this bundle, and for further details the UPGRADE-3.0.md document of sentry/sentry.

• [BC BREAK] This version uses the envelope endpoint. If you are
  using an on-premise installation it requires Sentry version >= v20.6.0 to work. If you are using sentry.io nothing will change and no action is needed.
• Enable back all error listeners from base SDK integration (#322)
• Add options.traces_sampler and options.traces_sample_rate configuration options (#385)
• [BC BREAK] Remove the options.project_root configuration option. Instead of setting it, use a combination of options.in_app_include and options.in_app_exclude (#385)
• [BC BREAK] Remove the options.excluded_exceptions configuration option. Instead of setting it, configure the IgnoreErrorsIntegration integration (#385)
• [BC BREAK] Refactorize the ConsoleCommandListener, ErrorListener, RequestListener and SubRequestListener event listeners (#387)
• Registered the CLI commands as lazy services (#373)
• [BC BREAK] Refactorize the configuration tree and the definitions of some container services (#401)
• Support the XML format for the bundle configuration (#401)
• PHP 8 support (#399, thanks to @Yozhef)
• Retrieve the request from the RequestStack when using the RequestIntegration integration (#361)
• Reorganize the folder structure and change CS standard (#405)
• [BC BREAK] Remove the monolog configuration option. Instead, register the service manually (#406)
• [BC BREAK] Remove the listener_priorities configuration option. Instead, use a compiler pass to change the priority of the listeners (#407)
• Prefer usage of the existing Symfony\Bridge\PsrHttpMessage\HttpMessageFactoryInterface service for the RequestFetcher class (#409)
• [BC BREAK] Change the priorities of the RequestListener and SubRequestListener listeners (#414)