Add QueueByTwoStacks.java new algorithm

[Hardvan]

• 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 76.47059% with 4 lines in your changes missing coverage. Please review.

Project coverage is 54.78%. Comparing base (f34fe4d) to head (fd1a14b).
Report is 24 commits behind head on master.

Files with missing lines	Patch %	Lines
...rithms/datastructures/queues/QueueByTwoStacks.java	76.47%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5623      +/-   ##
============================================
+ Coverage     54.56%   54.78%   +0.22%     
- Complexity     3413     3461      +48     
============================================
  Files           535      539       +4     
  Lines         15383    15600     +217     
  Branches       2935     2964      +29     
============================================
+ Hits           8393     8547     +154     
- Misses         6637     6697      +60     
- Partials        353      356       +3     

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[siriak]

Looks good, thanks!