Bad Cassandra modeling example

Bad modeling example for Cassandra trainings. Contains:

• schema definition
• cassandra-stress schenarios
• sample Java application for data generation

To run all stress tests, including the semantive.generator.model Java application:

1. Build .jar file for the Java application data generator: mvn package
2. Make sure there that the 9042 port isn't occupied by a host service or another container.
3. Spin up a cassandra node and run stress tests: docker-compose up --build