Implement Auto-fixing Capabilities

Add auto-fixing capabilities to formatting sniffs to increase value proposition and developer productivity.

Acceptance Criteria:

• Identify sniffs suitable for auto-fixing (formatting, spacing, etc.)
• Implement fixable property for applicable sniffs
• Add auto-fix logic for indentation sniff
• Add auto-fix logic for braces sniff
• Add auto-fix logic for spacing sniff
• Test auto-fix functionality thoroughly
• Update documentation with auto-fix examples

Related Files:

• src/ArtisanPackUI/Sniffs/Formatting/*.php
• Documentation files