Refactor to file-scoped namespaces

[samanazadi1996]

This pull request refactors the project to adopt file-scoped namespaces, bringing the codebase in line with modern C# standards and improving consistency. The refactoring was carried out using a custom Visual Studio extension that I developed, tailored specifically for this task. You can find the extension here: FileScopedNamespace Extension.

I believe this change will improve the codebase's readability and maintainability. Please review and let me know if any adjustments are needed.

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[BrennanConroy]

Basket.cs and BasketGrpc.cs are auto-generated files, could you remove the changes to them?

[adityamandaleeka]

@samanazadi1996 Thanks for opening this PR! It looks pretty good. I agree with @BrennanConroy's comment.

[samanazadi1996]

@BrennanConroy @adityamandaleeka
I have reverted the changes made to Basket.cs and BasketGrpc.cs, restoring them to their original state. Thank you again for your feedback!