Add a freon generator to create nested directories

This Jira proposes to add a functionality to freon to create nested directories. Also, multiple child directories can be created inside the leaf directory and also multiple top level directories can be created.
This functionality will help to determine the scalability of ozone by creating nested directories(may be in millions) and also it will allow to control nested directories properties, just by passing appropriate parameters. This all can be done just by executing a single command.