✨ Add positional arguments, verbose mode, and overwrite protection

[dyollb]

What do these changes do?

New Features:

• Positional/keyword-only arguments: Use Python's native *, syntax to control CLI argument patterns
• Auto-create directories: create_dirs=True (default) automatically creates parent directories for output files
• Verbose mode: Add verbose=True for --verbose/-v/-vv logging control with optional Rich formatting
• Overwrite protection: overwrite parameter with three modes - always (default), error+--force, or interactive prompt

Breaking Changes:

• Required Image/Transform parameters are now positional by default (was named)
• Use *, before parameters to make them keyword-only: def process(*, input: sitk.Image)

Other Changes:

• Switched to typer-slim for lighter weight installation
• Added rich as optional dependency for enhanced logging
• Added comprehensive examples