Fix CLI and Cleanup Network Scanner

[MGross21]

This PR simplifies the CLI and refactors network scanning for clarity and maintainability. It also includes small metadata updates.

Changes

CLI

• Show help when a command group is run without arguments by enabling no_args_is_help on all Typer subcommands.
• Add a global --verbose flag and centralize logging control via a Typer callback.
• Simplify the scan command to basic device discovery and monitoring only. Removed port and controller scanning options.

Network Scanner

• Refactor NetworkScanner to focus only on discovery and monitoring.
• Remove port scanning and controller specific logic from the core scanner.
• Improve error handling, thread safety, type annotations, and docstrings.

Metadata

• Add __author__ to armctl/__init__.py.
• Clarify the project description.
• Add pyserial as a dependency.