feat: add Weighted Interval Scheduling using DP and Binary Search

[Neha-2005-VCE]

Added Weighted Interval Scheduling algorithm.

• Uses Dynamic Programming and Binary Search
• Time Complexity: O(n log n)
• Space Complexity: O(n)
• Includes unit tests

This implementation finds the maximum profit such that no intervals overlap.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.96%. Comparing base (08d8c6b) to head (6519532).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1883      +/-   ##
==========================================
+ Coverage   85.91%   85.96%   +0.04%     
==========================================
  Files         379      380       +1     
  Lines       19778    19846      +68     
  Branches     3015     3033      +18     
==========================================
+ Hits        16993    17061      +68     
  Misses       2785     2785              

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