Issue 425 - Migrate to DotNet 8 - File-scoped namespaces: Algorithms,…

[gmottajr]

Issue 425 - Migrate to DotNet 8 - File-scoped namespaces: Algorithms, Knapsack,
LinearAlgebra, ModularArithmetic, Numeric

Please let me know whether or not it would be necessary to create new unit tests for this change.

Motivation and Context
Github issue #425: Proposed to update to File-scoped namespaces. It was requested to perform the changes in a few PRs to make them smaller and easier to review. This is the one only meant to update .NET version.

• 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

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (231167f) 94.50% compared to head (fc30ead) 94.50%.

Files	Patch %	Lines
Algorithms/Numeric/GaussJordanElimination.cs	94.82%	1 Missing and 2 partials ⚠️
...ithms/ModularArithmetic/ChineseRemainderTheorem.cs	97.22%	0 Missing and 2 partials ⚠️
...orithms/LinearAlgebra/Eigenvalue/PowerIteration.cs	94.44%	1 Missing ⚠️
Algorithms/Numeric/AmicableNumbersChecker.cs	87.50%	0 Missing and 1 partial ⚠️
Algorithms/Numeric/Decomposition/ThinSVD.cs	98.18%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #430   +/-   ##
=======================================
  Coverage   94.50%   94.50%           
=======================================
  Files         234      234           
  Lines        9843     9843           
  Branches     1455     1455           
=======================================
  Hits         9302     9302           
  Misses        381      381           
  Partials      160      160           

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[siriak]

Looks good, thanks!