feat: add closest pair of points algorithm

[saahil-mahato]

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Describe your change:

• [x] Add an algorithm?
• [ ] Fix a bug or typo in an existing algorithm?
• [ ] Documentation change?

Checklist:

• [x] I have read CONTRIBUTING.md.
• [x] This pull request is all my own work -- I have not plagiarized.
• [x] I know that pull requests will not be merged if they fail the automated tests.
• [x] This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• [x] All new JavaScript files are placed inside an existing directory.
• [x] All filenames should use the UpperCamelCase (PascalCase) style. There should be no spaces in filenames. Example:UserProfile.js is allowed but userprofile.js,Userprofile.js,user-Profile.js,userProfile.js are not
• [x] All new algorithms have a URL in their comments that points to Wikipedia or another similar explanation.
• [x] If this pull request resolves one or more open issues then the commit message contains Fixes: #{$ISSUE_NO}.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 84.78%. Comparing base (9010481) to head (322ca8e).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1706 +/- ## ========================================== + Coverage 84.65% 84.78% +0.12% ========================================== Files 378 379 +1 Lines 19744 19904 +160 Branches 2951 2978 +27 ========================================== + Hits 16715 16875 +160 Misses 3029 3029 ```

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