feat: add jaw-dropping JS interview questions

[abbadinikhilreddy55]

This PR adds a new file jaw-dropping-questions.md containing several advanced JavaScript interview questions that I recently came across. These questions are commonly asked in real interviews and help developers prepare for tricky edge-case topics.
✅ What’s Included
6 advanced JavaScript interview questions
Short, clear explanations for each
Topics like type coercion, event loop, microtasks, TDZ, array behavior, etc.
🎯 Purpose
To help beginners and contributors quickly revise confusing and surprising JavaScript concepts that frequently appear in technical interviews.

[sudheerj]

@abbadinikhilreddy55 Thanks for PR. Some of these questions already appeared in the list. Please update it accordingly. May be you can add separate section at the bottom with unique list of one liner Q&A.