Spring Boot support for Log4j2

[adinauer]

Problem Statement

Currently needs manual setup.

Solution Brainstorm

Similar to Logback where we support sentry.logging.* we could add support for Log4j2.
Auto configure, support changing levels, maybe loggers too.

[linear]

JAVA-278

[github-actions]

A PR closing this issue has just been released 🚀

This issue was referenced by PR #5403, which was included in the 8.57.0 release.