Implement cluster sub command line tool

### Search before asking

- [x] I searched in the [issues](https://github.com/alibaba/fluss/issues) and found nothing similar.

### Description

Cluster related commands.

### Willingness to contribute

- [x] I'm willing to submit a PR!

The issue names no files, tests, or command entry points and only describes cluster-related commands. Start by locating the existing command-line structure and determine the intended cluster command scope; done means the agreed cluster subcommands are implemented and their behavior is covered by the project's command tests.

Written by the indexing model from the issue text.