Refactor: Change namespace of CSharpFormatter class

The namespace of the `CSharpFormatter` class has been changed from
`WireMockInspector.ViewModels` to `WireMockInspector.CodeGenerators`.
This reorganization better categorizes the class under a namespace
that aligns with its functionality related to code generation.

src/WireMockInspector/CodeGenerators/CSharpFormatter.cs

@@ -4,7 +4,7 @@
 using System.Linq;
 using Newtonsoft.Json.Linq;
 
-namespace WireMockInspector.ViewModels;
+namespace WireMockInspector.CodeGenerators;
 
 internal static class CSharpFormatter
 {