refactor: Dijkstra algorithm

[alxkm]

Rename the previous file from capital letters to the standard Java name.
Adding tests to this algorithm.
Adding Javadocs.

• 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

Attention: Patch coverage is 96.55172% with 1 line in your changes missing coverage. Please review.

Please upload report for BASE (master@e32cab3). Learn more about missing BASE report.

Files	Patch %	Lines
...ithms/datastructures/graphs/DijkstraAlgorithm.java	96.55%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #5329   +/-   ##
=========================================
  Coverage          ?   42.86%           
  Complexity        ?     2661           
=========================================
  Files             ?      522           
  Lines             ?    15483           
  Branches          ?     2950           
=========================================
  Hits              ?     6637           
  Misses            ?     8561           
  Partials          ?      285           

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