Add unit test for com.thealgorithms.dynamicprogramming.EditDistance

[nguyentanphat8694]

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized it.
• All filenames are in PascalCase.
• All functions and variable names follow Java naming conventions.
• All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
• All new code is formatted with clang-format -i --style=file path/to/your/file.java

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.65%. Comparing base (d102fa7) to head (33dd8f5).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6108      +/-   ##
============================================
+ Coverage     73.54%   73.65%   +0.10%     
- Complexity     5108     5114       +6     
============================================
  Files           658      658              
  Lines         17649    17649              
  Branches       3396     3396              
============================================
+ Hits          12980    12999      +19     
+ Misses         4166     4147      -19     
  Partials        503      503              

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[siriak]

Looks good, thanks!