Add sqlite3_format_query_result() interactive demo

SQLite QRF (Query Result Formatter) demo page compiled from the
sqlite/sqlite ext/qrf extension to WebAssembly. Features:

- 15 output format styles: Box, Column, CSV, JSON, Markdown, HTML,
  Insert, Line, List, Quote, Table, Explain, EQP, JObject, Count
- Configurable options: screen width, column wrap, borders, NULL
  display, column headers
- Pre-loaded demo database with employees, products, and orders tables
- 18 example queries showcasing different format styles and SQL patterns
- All processing runs locally in-browser via WASM (SQLite 3.54.0)

https://claude.ai/code/session_0168kpQeUR63VfXcvD8cEBmc

Author: claude