feat: add DoubleBuffer implementation and initial tests

[abda-gaye]

• [x] I have read and followed the guidelines outlined in CONTRIBUTING.md.
  Yes, I have read and followed the guidelines provided in the CONTRIBUTING.md file.

• [x] This pull request contains only my own work; it has not been plagiarized.
  Yes, this pull request contains only my original work and has not been plagiarized.

• [x] All filenames follow the PascalCase convention.
  Yes, all filenames follow the PascalCase convention.

• [x] All function and variable names adhere to Java naming conventions.
  Yes, all function and variable names adhere to Java naming conventions.

• [] All new algorithms include a URL in their comments linking to a Wikipedia page or a similar source for reference.

• [x] All code is formatted using clang-format -i --style=file /datastructures/buffers/DoubleBufferTest.java

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 89.65517% with 3 lines in your changes missing coverage. Please review.

Project coverage is 66.83%. Comparing base (33dee07) to head (b445e84).

Files with missing lines	Patch %	Lines
...lgorithms/datastructures/buffers/DoubleBuffer.java	89.65%	0 Missing and 3 partials :warning:

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5885      +/-   ##
============================================
+ Coverage     66.81%   66.83%   +0.02%     
- Complexity     4501     4515      +14     
============================================
  Files           611      612       +1     
  Lines         16958    16987      +29     
  Branches       3275     3281       +6     
============================================
+ Hits          11330    11354      +24     
- Misses         5181     5182       +1     
- Partials        447      451       +4     

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