Apache Druid

I figured it out.  sigar and zstd-jni need to installed into `/Library/Java/Extensions` and in my case I needed `zstd-jni-1.5.2-5-darwin_aarch64.jar` to match the M2 architecture

Still didn't get it working.  I ended up skipping the specific tests that use this library.  To do that I added
```-Dtest='!org.apache.druid.java.util.common.CompressionUtilsTest, !org.apache.druid.java.util.metrics.*Test'```
to the maven command.

is this specific to M2? does it work on M1?

I don't know, I only have an M2 and no way to test on and M1.

This issue seems to be occurring due to libsigar not providing aarch64 based binaries. When I faced this issue in the past what worked is changing jdk from aarch64 based to x86 one (maybe Rosetta - the translation environment of mac m1 is allowing x86 arch based jdk to run x86_64 based libsigar-universal64-macosx.dylib file).