Sentry Structured Logging for Symfony

[cleptric]

Sentry is adding support for structured logging. Let's add it to the Symfony SDK!

One initial support for the PHP SDK is released, we can add a Monolog compatible logger.

[cleptric]

To give a quick update, we'll likely ship support for logs next week 🤞

[cleptric]

Release is currently blocked by doctrine/DoctrineBundle#1925.

[cleptric]

We just released Logs in v5.4.0. Docs can be found on https://docs.sentry.io/platforms/php/guides/symfony/logs/.