Sync .editorconfig and .gitattributes with azsdk repo (#91)

* Refactor code to ensure consistent formatting and improve readability across multiple files

- Added missing newlines at the end of several C# files to comply with coding standards.
- Reorganized using directives for better clarity in various service and model files.
- Enhanced code readability by breaking long lines and ensuring proper indentation.
- Updated tests to maintain consistency with the refactored code structure.
- Introduced a .gitattributes file to manage line endings and text attributes for various file types.

* Add copyright and license comments to EnvironmentVariableHelpers.cs

.gitattributes

@@ -0,0 +1,8 @@
+* text=auto
+
+*.{bmp,dll,gif,jpg,png,snk,exe,wmv,mp4,ismv,isma} binary
+
+*.cs text diff=csharp
+*.csproj text=auto
+*.sln text=auto eol=crlf
+*.sh text=auto eol=lf