feat: Add MinStackUsingTwoStacks new algorithm with Junit tests

[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 84.61538% with 2 lines in your changes missing coverage. Please review.

Project coverage is 63.98%. Comparing base (6682c7c) to head (cdc4952).

Files with missing lines	Patch %	Lines
...m/thealgorithms/stacks/MinStackUsingTwoStacks.java	84.61%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5758      +/-   ##
============================================
+ Coverage     63.96%   63.98%   +0.01%     
- Complexity     4172     4178       +6     
============================================
  Files           583      584       +1     
  Lines         16320    16333      +13     
  Branches       3150     3151       +1     
============================================
+ Hits          10439    10450      +11     
- Misses         5456     5457       +1     
- Partials        425      426       +1     

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[alxkm]

This contribution looks like from leetcode. And according to rules, could you please provide any sources that describe that this is not from leetcode or similar resources.

[Hardvan]

The MinStackUsingTwoStacks algorithm is a widely known solution in data structures, frequently discussed in programming interviews and textbooks. It is not exclusive to LeetCode but is a classic problem in designing a stack that supports push(), pop(), and retrieving the minimum element in constant time using two stacks—one to store the elements and the other to track the minimum values. You can find similar implementations and discussions on several well-known platforms, such as GeeksforGeeks and Stack Overflow, as well as in books like Cracking the Coding Interview.

• Design and Implement Special Stack Data Structure | Added Space Optimized Version
  
• Stack Overflow: MinStack discussion
• Design a stack that supports getMin() in O(1) time and O(1) extra space

This problem is a common way to assess problem-solving skills and understanding of space-time trade-offs in interviews and is thus not tied to any single platform.