Complete project Algorithms - Switch to file-scoped namespace

[gmottajr]

Issue 425 - Migrate to DotNet 8 - File-scoped namespaces:

Algorithms --> Sorters and Strings.

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: 20 lines in your changes are missing coverage. Please review.

Comparison is base (691d270) 94.42% compared to head (965d7ef) 94.48%.

Files	Patch %	Lines
Algorithms/Sorters/Comparison/TimSorter.cs	94.09%	12 Missing and 6 partials ⚠️
Algorithms/Strings/Similarity/JaroSimilarity.cs	94.87%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@ Coverage Diff @@ ## master #433 +/- ## ========================================== + Coverage 94.42% 94.48% +0.06%  ========================================== Files 234 234 Lines 9843 9843 Branches 1455 1455 ========================================== + Hits 9294 9300 +6  + Misses 387 384 -3  + Partials 162 159 -3 

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[siriak]

Looks good, thanks!