Documentation(1018996): Add sample for Different Form Recognizer Options in SmartFormRecognizer

[VenkateshwaranSF5013]

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

Highlights:

• Included examples for form recognition, table extraction, 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.