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.