Implement Bidirectional BFS algorithm

[darkatwi]

This class implements the Bidirectional Breadth-First Search (BFS) algorithm to determine if a path exists between two nodes in an unweighted graph. It explores the graph from both the start and goal nodes simultaneously, improving efficiency for large graphs.

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• 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.
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[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 28 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.47%. Comparing base (a9ba87c) to head (bc05bce).

Files with missing lines	Patch %	Lines
...rithms/datastructures/graphs/BidirectionalBFS.java	0.00%	28 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #7146      +/-   ##
============================================
- Coverage     78.56%   78.47%   -0.10%     
- Complexity     6794     6795       +1     
============================================
  Files           762      763       +1     
  Lines         22520    22548      +28     
  Branches       4429     4436       +7     
============================================
+ Hits          17693    17694       +1     
- Misses         4115     4143      +28     
+ Partials        712      711       -1     

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[github-actions]

This pull request has been automatically closed because its workflows or checks failed and it has been inactive for more than 14 days. Please fix the workflows and reopen if you'd like to continue. Merging from main/master alone does not count as activity.