Add strand sort

[anaslimem]

Pull Request Template

Description

Added the Strand Sort algorithm to the sorting module. Strand sort is a recursive/iterative sorting algorithm that sorts items of a list into increasing order. It works by repeatedly pulling sorted sublists out of the list and merging them with a sorted result list. The implementation provided ensures $O(N)$ best-case time complexity, where elements are already sorted or reverse-sorted, and $O(N^2)$ worst-case time complexity.

References:

• Strand sort - Wikipedia

Type of change

• New feature (non-breaking change which adds functionality)

Checklist:

• I ran bellow commands using the latest version of rust nightly.
• I ran cargo clippy --all -- -D warnings just before my last commit and fixed any issue that was found.
• I ran cargo fmt just before my last commit.
• I ran cargo test just before my last commit and all tests passed.
• I added my algorithm to the corresponding mod.rs file within its own folder, and in any parent folder(s).
• I added my algorithm to DIRECTORY.md with the correct link.
• I checked CONTRIBUTING.md and my code follows its guidelines.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.04%. Comparing base (a84b940) to head (553479e).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1024      +/-   ##
==========================================
+ Coverage   96.02%   96.04%   +0.01%     
==========================================
  Files         386      387       +1     
  Lines       29011    29086      +75     
==========================================
+ Hits        27858    27935      +77     
+ Misses       1153     1151       -2     

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