Implement the `telestion-terminal-core` module

[fussel178]

Here are some steps to catch up:

• The telestion-terminal-core module already contains a class you can start with. Clone this repository and create a working branch named feat/core/implementation.
• To give you the application backend, clone the https://github.com/wuespace/telestion-project-playground and checkout the feat/application/tcp-eventbus-bridge branch.
• Run the application via the context menu on the right side "Tasks" -> "application" -> "run".
• Run the existing code in the telestion-terminal-core via the green arrow beside the main method.
• Take a look at the source code and the API from the vertx-event-bus.
• Lets use the https://github.com/mabe02/lanterna library to create a semi-graphical terminal application.
• Take a look at the tutorials https://github.com/mabe02/lanterna/blob/master/docs/contents.md and do some of them.
• Try to display a changable string in the terminal application.
• Now connect the EventBus Client and with the terminal application and show a string that can be changed from the application.
• Add some sort of input to the terminal application and try to publish a message via the EventBus Client and check if the message is received in the application.
• Ask @fussel178 and @pklaschka for further steps