refactor: BalancedBrackets

[alxkm]

Some improvements.
Added tests.

• 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

All modified and coverable lines are covered by tests ✅

Project coverage is 47.60%. Comparing base (580aa0c) to head (c19355a).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5391      +/-   ##
============================================
+ Coverage     47.50%   47.60%   +0.10%     
- Complexity     2934     2944      +10     
============================================
  Files           524      524              
  Lines         15316    15312       -4     
  Branches       2907     2906       -1     
============================================
+ Hits           7276     7290      +14     
+ Misses         7739     7720      -19     
- Partials        301      302       +1     

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

[siriak]

Could you make the tests parameterized? To avoid having 1 test that checks everything with separate assertions