added Leetcod problem 20 solution

[RajdeepDey010]

🚀 What does this PR do?

• Adds solution for LeetCode Daily Challenge on (27.10.24) in (JS).
• I have used stack and object. This problem is to identify the order of opened and closed parenthesis. The object is used to store the pattern of open & close parenthesis, stack is used to track the open parenthesis and pops the parenthesis at top when a closed parenthesis is found on traversing the input within loop. Hence, we get a valid or invalid parenthesis.

📝 Issue Reference:

Fixes issue: #25

🔍 Checklist:

Please ensure the following before submitting your PR:

• [x] I have placed my solution in the correct folder (solutions/day25/).
• [x] My code follows clean coding practices and is efficient.
• [X] I have tested the solution on LeetCode and it works correctly.

🔧 Solution Details:

• Language Used: (e.g., Python, Java, C++, etc.)
• Time Complexity: (e.g., O(n log n), O(n), etc.)
• Space Complexity: (e.g., O(1), O(n), etc.)

🌟 Additional Notes (if any):

Since every valid sequence should have an even length, therefore I check the length of input for even value at the start of the function.

[arya2004]

This was not the Daily Leetcode question on 25th October 2024. This PR is closed