feat: add throttle function example code in codeing exercise

[codomposer]

Add Throttle Function Interview Question Example

Overview

This PR adds a comprehensive throttle function example to the JavaScript interview questions repository, providing a valuable companion piece to the existing debounce function example.

Changes Made

• Added throttle-function/ directory under coding-exercise/
• Created throttle.js - Complete implementation with multiple approaches, detailed comments, and working demonstration
• Created README.md - Comprehensive documentation covering:
  • Challenge description and use cases
  • Implementation approaches (leading edge, leading + trailing)
  • Throttle vs Debounce comparison table
  • Interview tips and common questions
  • Common pitfalls and solutions
  • Advanced variations and testing considerations

Why This Matters

• Interview Preparation: Throttle functions are a common JavaScript interview topic, often asked alongside debounce
• Performance Optimization: Essential concept for handling high-frequency events (scroll, resize, mouse move)
• Code Quality: Demonstrates advanced JavaScript concepts like closures, higher-order functions, and timing management
• Real-World Relevance: Covers practical scenarios like API rate limiting, scroll performance, and game development

Key Features

• ✅ Multiple implementation strategies
• ✅ Detailed inline documentation and JSDoc
• ✅ Working code examples with console output
• ✅ Comprehensive comparison with debounce
• ✅ Interview-ready explanations and tips
• ✅ Performance benefits and use case examples

Testing

The code has been tested and produces expected output, demonstrating throttling behavior by reducing function calls from 8 potential executions to 3 actual executions (62.5% reduction).

Related

This complements the existing debounce-function/ example, providing developers with both essential performance optimization patterns for JavaScript interviews.

[codomposer]

@sudheerj I think current failing workflow is not related with my new code