Add Log4j2 benchmark tool

- Configurable thread count, duration, message size
- Multiple logging configurations: sync-immediate, sync-buffered
- AsyncLogger variants: 1k, 4k, 10k, 1m ring buffer sizes
- AsyncAppender variants: 1k, 4k, 10k, 1m buffer sizes
- Subprocess isolation for proper async logger initialization
- Cache dropping between tests for accurate benchmarks
- CSV output support

1 files changed, 8 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
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index 0000000..50c680b
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+target/
+*.log
+*.class
+*.jar
+.idea/
+*.iml
+.DS_Store
+dependency-reduced-pom.xml