feat: Add extractor hooks and validation system

[Soroushsrd]

• Add ExtractorHook trait for lifecycle observability
• Add ExtractorValidatorHook trait for custom validation
• Add ExtractorWithHooks extension trait
• Add comprehensive documentation and examples
• Add integration tests for hook functionality"

closes #770

[Soroushsrd]

Hey Josh. I would love to hear your take on how I implemented this feature. If it can be done better, please let me know

[Soroushsrd]

Got it. thank you for the comments. will sort them out.