Added another method to check valid parentheses in ValidParentheses.java

[TaranjeetSinghKalsi]

Added another method to check valid parentheses in ValidParentheses.java. Also added related testcases.

• 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 81.81818% with 2 lines in your changes missing coverage. Please review.

Project coverage is 58.02%. Comparing base (732f7c8) to head (59951de).

Files with missing lines	Patch %	Lines
...va/com/thealgorithms/strings/ValidParentheses.java	81.81%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5616      +/-   ##
============================================
+ Coverage     57.99%   58.02%   +0.02%     
- Complexity     3656     3660       +4     
============================================
  Files           546      546              
  Lines         15738    15749      +11     
  Branches       2992     2996       +4     
============================================
+ Hits           9128     9139      +11     
+ Misses         6224     6223       -1     
- Partials        386      387       +1     

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