Add class documentation, improve comments in MazeRecursion.java

[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 54.16667% with 11 lines in your changes missing coverage. Please review.

Project coverage is 57.91%. Comparing base (62144f6) to head (7b98bee).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
.../com/thealgorithms/backtracking/MazeRecursion.java	54.16%	7 Missing and 4 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5576      +/-   ##
============================================
+ Coverage     57.80%   57.91%   +0.11%     
- Complexity     3644     3646       +2     
============================================
  Files           545      545              
  Lines         15696    15672      -24     
  Branches       2993     2984       -9     
============================================
+ Hits           9073     9077       +4     
+ Misses         6244     6215      -29     
- Partials        379      380       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[Hardvan]

I modified the class to accept a maze as a parameter and return the solution instead of printing it. I also added JUnit tests to validate the functionality.

[siriak]

Looks good, thanks!