feat: Fermat's last theorem test

[ridge-kimani]

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Describe your change:

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

Checklist:

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

[codecov-commenter]

Codecov Report

❌ Patch coverage is 88.60759% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.88%. Comparing base (1d252d7) to head (421e960).
⚠️ Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
Maths/FermatsLastTheoremTest.js	88.60%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1789      +/-   ##
==========================================
+ Coverage   85.87%   85.88%   +0.01%     
==========================================
  Files         377      378       +1     
  Lines       19720    19799      +79     
  分支     3005     3016      +11     
==========================================
+ Hits        16935    17005      +70     
- Misses       2785     2794       +9     

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