Refactor command handling

[andreychh]

The current CLI implementation in Application.java is responsible for both parsing command-line arguments and executing commands, without separating these concerns.

I propose refactoring the CLI to use a command pattern:

• Add a CLICommand interface and implement separate commands for --help, --version, and main execution logic.
• Introduce a dispatcher (e.g. CLICommands class) to select and execute the appropriate command based on input arguments.
• Improve error handling by adding a custom CLIException for CLI-specific errors.

[andreychh]

@yegor256 WDYT?

[yegor256]

@andreychh sounds right, let's do it

[0crat]

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