Add rollupsmachine module

[renan061]

📚 Context

The rollupsmachine module provides, through the RollupsMachine structure, a way for you to perform structured interactions with the cartesi machine.

You can instantiate a RollupsMachine by calling the rollupsmachine.Load function.
The RollupsMachine structure contains five methods: Fork, Destroy, Hash, Advance, and Inspect.

You can also call rollupsmachine.StartServer and rollupsmachine.StopServer to handle the JSON RPC remote server.

📈 Subtasks

• Add the StartServer and StopServer functions.
• Add the Load method.
• Add the RollupsMachine struct with its methods.
• Test the module.