feat: add smith-waterman sequence alignment algorithm

[saahilmahato]

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• This pull request is all my own work -- I have not plagiarized it.
• All filenames are in PascalCase.
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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.37%. Comparing base (50b1bcd) to head (b7ccae7).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #6708   +/-   ##
=========================================
  Coverage     76.36%   76.37%           
- Complexity     5935     5942    +7     
=========================================
  Files           711      712    +1     
  Lines         20175    20189   +14     
  Branches       3910     3914    +4     
=========================================
+ Hits          15407    15419   +12     
- Misses         4178     4179    +1     
- Partials        590      591    +1     

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[alxkm]

Looks good. Thank you for the contribution.