Add new PTAB endpoints and align models with live USPTO API

[dpieski]

Summary

This pull request updates pyUSPTO to align with the latest live USPTO Open Data Portal APIs and improves the overall reliability, data accuracy, and documentation quality.

API and Model Updates

• Updated patent_data models to reflect the current API responses instead of outdated schema documentation
• Added and enhanced support for PTAB datasets, including trials
• Improved validation logic, sanitization, and consistency across models
• Enhanced clients with better configuration handling and error reporting

Testing Improvements

• Fixed and expanded integration tests based on real API behavior
• Updated unit tests to match corrected data models
• Achieved full test coverage for core functionality

Documentation Work

• Updated examples to reflect correct API usage
• Cleaned up and standardized docstrings throughout the codebase
• Improved documentation structure, theme, and supporting assets

Codebase Maintenance

• Refactored code organization for better maintainability
• Cleaned up imports, formatting, and type hints
• Updated packaging, lock files, and metadata

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