Feature: Find ESP-IDF Code Examples

[maitiSoutrik]

Add a new MCP tool find_examples(keyword: str, target: str) to search for relevant ESP-IDF example code.

Functionality:

• Takes a keyword (e.g., 'wifi scan', 'gpio interrupt', 'i2c eeprom') and optional target as input.
• Searches the ESP-IDF examples directory ($IDF_PATH/examples) or an online repository of examples.
• Returns a list of matching example project names, paths, and brief descriptions.