chore: add GlobalUsings.cs with project-wide using directives for Algorithms folder

[KaranChadha10]

Description

This PR contains the following points:

• Introduced GlobalUsings.cs to centralize common namespaces across the solution
• Improved readability and reduced boilerplate by removing redundant using statements

NOTE: These Changes are only done for the Algorithms folder as the file changes were more than 100 files.

Issue link: #520

• I have performed a self-review of my code
• My code follows the style guidelines of this project
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Comments in areas I changed are up to date
• I have added comments to hard-to-understand areas of my code
• I have made corresponding changes to the README.md

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.15%. Comparing base (1b9aa7e) to head (d4bc12a).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #522      +/-   ##
==========================================
- Coverage   95.19%   95.15%   -0.04%     
==========================================
  Files         272      272              
  Lines       10921    10921              
  Branches     1536     1536              
==========================================
- Hits        10396    10392       -4     
- Misses        400      403       +3     
- Partials      125      126       +1     

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[Copilot]

Pull Request Overview

This PR introduces a global using directives file for the Algorithms folder to centralize common namespaces and reduce boilerplate code across the solution. The changes remove redundant using statements from source files while maintaining functionality through the global imports.

• Adds GlobalUsings.cs to centralize using directives for the Algorithms folder
• Removes redundant using statements from 100+ files in the Algorithms directory
• Improves code readability and maintainability by eliminating boilerplate

Comments suppressed due to low confidence (5)

Algorithms/Strings/Similarity/OptimalStringAlignment.cs:1

• ArgumentNullException.ThrowIfNull expects the parameter value, not the parameter name. It should be ArgumentNullException.ThrowIfNull(firstString) and ArgumentNullException.ThrowIfNull(secondString).

namespace Algorithms.Strings.Similarity

Algorithms/Other/SieveOfEratosthenes.cs:1

• [nitpick] Consider adding a space after 'for' keyword for consistency with the project's formatting style, as seen in the corrected line 41 in MakeChangeSequence.cs.

namespace Algorithms.Other;

Algorithms/Other/SieveOfEratosthenes.cs:1

• [nitpick] Consider adding a space after 'for' keyword for consistency with the project's formatting style, as seen in the corrected line 41 in MakeChangeSequence.cs.

namespace Algorithms.Other;

Algorithms/Other/SieveOfEratosthenes.cs:1

• [nitpick] Consider adding a space after 'for' keyword for consistency with the project's formatting style, as seen in the corrected line 41 in MakeChangeSequence.cs.

namespace Algorithms.Other;

Algorithms/Knapsack/BranchAndBoundKnapsackSolver.cs:1

• [nitpick] Consider adding a space after 'if' keyword for consistency with the project's formatting style, as seen in similar corrections throughout the codebase.

namespace Algorithms.Knapsack;

---

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[siriak]

Looks good, thanks!