Feature: Implement furiko CLI

[irvinlim]

We will implement a basic command line interface (CLI) utility furiko, which provides a kubectl-like interface to interact with a Kubernetes API server.

The goals of the CLI tool include:

1. Providing shortcuts to simplify and streamline commonly performed actions.
2. Providing a TUI (terminal user interface) when appropriate, for example prompting for option values before executing a JobConfig.

The CLI should NOT be a full replacement of kubectl, but it should be sufficient for 80-90% of users' use cases. They can dig into kubectl if they need to.

[irvinlim]

Future CLI feature requests can be opened in a separate issue. Closing.