Added tournament sort algorithm

[remememe]

Description

Implements tournament sort algorithm.
https://en.wikipedia.org/wiki/Tournament_sort

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 COUNTRIBUTING.md and my code follows its guidelines.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.85%. Comparing base (fa0aa80) to head (7c6bc51).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1046      +/-   ##
==========================================
+ Coverage   95.84%   95.85%   +0.01%     
==========================================
  Files         394      395       +1     
  Lines       30084    30160      +76     
==========================================
+ Hits        28833    28909      +76     
  Misses       1251     1251              

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[remememe]

@siriak Hello could you please take a look at this PR when you have a moment?

[Copilot]

Pull request overview

Adds a new sorting algorithm implementation (tournament sort) to the sorting module and wires it into the module exports and repository directory index.

Changes:

• Introduces tournament_sort implementation and unit tests in src/sorting/tournament_sort.rs.
• Exports the new algorithm from src/sorting/mod.rs.
• Adds the algorithm link to DIRECTORY.md.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
src/sorting/tournament_sort.rs	New tournament sort implementation + tests.
src/sorting/mod.rs	Registers the new module and re-exports tournament_sort.
DIRECTORY.md	Adds the new algorithm to the Sorting section index.

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[siriak]

Please check Copilot's comments if they are relevant

[remememe]

@siriak I’ve made the necessary changes, and it should be ready for merging.

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

[siriak]

Looks good, thanks!