Documentation(1018996): Added Samples for Smart Data, Table, and Form Recognizer

[VenkateshwaranSF5013]

This PR adds multiple sample projects demonstrating the usage of Syncfusion Smart Data Extractor.

• Included examples for form recognition, table extraction, and data extraction workflows
• Demonstrated options like confidence threshold, page range, JSON export, and image input
• Added proper namespace and class structures for CI consistency
• Each sample shows extractor configuration and saving results in PDF/JSON formats
• Provides clear, beginner‑friendly code blocks for quick reference