Import atomix-storage into controller.git

atomix.io has switched its implementation to Go and the Java implementation has been archived.

This is problematic, as the last release depends on an ancient Kryo version and upgrade requires API-incompatible changes.

The code is licensed under APL2, so this should not be a problem.

We only require atomix-storage and atomix-utils (as a dependency). Import atomix-archive.git/(storage/utils) into controller.git/third-party/atomix directory with full history, so that we have:

/third-party                // parent directory
/third-party/atomix         // parent directory
/third-party/atomix/storage // code&history from atomix-archive.git/storage
/third-party/atomix/utils   // code&history from atomix-archive.git/utils

In the controller repository.